Hell's Park Underside/Spike Hell Area/Force

Combat stats use the screenshot’s level, STR, MAG and VIT with the base stat formulas. Enemy skill bonuses are not included. HP is the recorded maximum.

Sources

Recommended demons

Follow the selected challenge’s roster/archetype rules. Special bonuses require the matching Underside skill, not merely the same demon name. Kill King Frost first with Force damage before the MP drain snowballs; use Divine brands where needed.

Earlier recommended alternatives

KumbhandaBanner exclusive

Banner: focused Force burst

Souljack offers high-power single-target Force/Ice damage with Bulwark Pierce and an extra icon, useful for removing King Frost.

Needs: Build PATK/accuracy and confirm Force is the selected element. Banner option for unrestricted clears only; not legal for a fusible-only or 4★-only challenge.

Watch for: Automatic element selection and fractional follow-up are not substitutes for checking the enemy’s affinities.

Earlier recommended alternatives

MermaidAlternative

Area-specific option

Use Force attacks and the matching Underside skill where available. For Phys, Cerberus also supplies Intimidation through Hell Claw.

Earlier recommended alternatives

Huang LongAlternative

Fusible defence

Five Elements can suppress Heimdall’s Almighty magic. Keep the chosen attack element available through transfers.

Earlier recommended alternatives

BaalAlternative

Fusible damage

Build specifically for Force damage and the challenge’s legal archetype. Check accuracy for physical attacks and preserve MP.

Kit-based options; tested clears remain in the guide’s team section.

Skills on multiple demons:

Hell Recovery

Used by: Mandrake, Heimdall, King Frost

Adds Null Bind/MortaI. +80% to hit rate. +300 to Phys ATK and Mag ATK. +300% to status ailment auto recovery rate.

Source

Hell Ultra Booster

Used by: Mandrake, King Frost

+20% to Max HP. +100 to Phys ATK and Mag ATK. +25% to damage dealt. +100% to Healing skill effectiveness.

Source

Skills on Mandrakes only:

Dark Pierce [weak] Underside

Used by: Mandrake

Gains Dark Pierce. Damage received by enemy through this skill is reduced by 70% if the enemy has Null, Repel or Drain Dark attribute.

Source

Hellsent: Dark

Used by: Mandrake

+40% to Max HP.. +100 to Phys ATK and Mag ATK.

Activates the following Chain Effect at the start of every second turn of the skill holder: Inflicts high-accuracy Dark damage (Physical, Power: 200) with a Bulwark-piercing effect and a 100% critical hit rate on all enemies.

Source

Skills on Heimdall only:

Stout Horn [Underside]6 MP

Used by: Heimdall

Inflicts Almighty damage (Magic, Power: 200) to a single enemy, and activates the following Chain Effect if the attack is successful: Increases the ATK, DEF, and EV/AC of all party members by 20%. (1 turn) This skill becomes Heroic Horn: Underside when the skill holder's HP becomes 50% or less. Heroic Horn: Underside Inflicts Almighty damage (Magic, Power: 200) to a single enemy, and activates the following Chain Effect if the attack is successful: Inflicts 25% Fractional damage (Max: 1000) based on Max HP on all enemies, and then reduces their MP by 2.

Source

Hell Eater

Used by: Heimdall

Activates the following Chain Effect at the start of enemy turn: Inflicts Almighty damage (Magic, Power: 20) on all enemies and drains 4MP.

Source

Hell Mega Booster

Used by: Heimdall

+30% to Max HP. +200 to Phys ATK and Mag ATK. +50% to damage dealt. +200% to Healing skill effectiveness.

Source

Hellbound: Phys

Used by: Heimdall

+50% to Max HP. +200 to Phys ATK and Mag ATK.

Activates the following Chain Effect at the start of enemy turn: Place 5 counts of Spirit Chains of Suppression on all enemies. (Once per battle)

Activates the following Chain Effect at the start of every third turn of the skill holder: Inflicts high-accuracy Phys damage (Physical, Power: 300) with a Bulwark-piercing effect and a 100% Critical hit rate on all enemies.

Source

Skills on King Frost only:

Ice Pierce [weak] Underside

Used by: King Frost

Gains Ice Pierce. Damage received by enemy through this skill is reduced by 70% if the enemy has Null, Repel or Drain Ice attribute.

Source

Cold World [Underside]7 MP

Used by: King Frost

Inflicts Ice damage (Magic, Power: 130) with a Bulwark-piercing effect on all enemies, then reduces their DEF by 20% (3 turns)and reduces their MP by 2.

Source

Hellsent: Ice

Used by: King Frost

+40% to Max HP.. +100 to Phys ATK and Mag ATK.

Activates the following Chain Effect at the start of every second turn of the skill holder: Inflicts high-accuracy Ice damage (Physical, Power: 200) with a Bulwark-piercing effect and a 100% critical hit rate on all enemies.

Source

Explanation

• Hellbound: Phys will apply 5 stacks of Spirit Chains of Suppression to you.
• Hell Eater drains your MP whenever your turn starts, and King Frost will drain your MP with Ice Cold World Underside when he attacks (as well as applying ). When Heimdall falls below 50% HP, his Almighty Stout Horn Underside will also start draining your MP.
• If you fail to kill the adds by the start of their second turn, they will hit you with a bulwark-piercing, 100%-crit enrage AoE. Heimdall will do one too, if he isn't dead by his third turn - however his lacks phys pierce, so it can be reflected back at him with Repel Physical.

Mermaid (Underside) effect overview

• Self gets 50% HP, 180% Force damage, 20% accuracy, 3 MP discount for Force skills, and immunity to Spirit Chains of Suppression.
• The team gets 20% Force damage and 20% accuracy.
• If any team member hits a weak point, Mermaid restores 2 MP to the whole team (up to 3 times per turn).

Colors

• Clear for the fusibles ruleset.
• Purple for Infinite Chakra (+1 MP regen, like Divine brands).
  • While this seems useful to counteract the enemy's MP draining, it might not be necessary. The most-expensive skill she should be using, Killing Wind, costs 7 MP and she discounts that to 4 MP. Her team-wide MP recovery also means she should have plenty of MP to work with.

Skill Transfer

• Killing Wind (Underside) is ideal, otherwise use the highest-damage single-target attack skill you have. For example: Killing Wind.
• Zandyne works as a cheap alternative.

Brands

• MATK% Spell.
• Due to her MP discount and MP restores (counteracting the enemy's MP drains), Divine's MP regen is probably not necessary.

Jack Frost (Underside) effect overview

• Self gets Concentrate (2.25x damage) on his first action - this is about 63% damage on average across his 2 actions on the first turn. Also gets 50% HP and immunity to Spirit Chains of Suppression.

Colors

• (Any)

Skill Transfer

• Use Zandyne.
• Jack Frost does not have any MP discounts, so 7 MP skills such as Killing Wind may be too expensive to cast repeatedly.
  • Killing Wind (Underside) starts at 7 MP, then becomes 6 MP at max level. This is the best skill he can use, but the cost of maxing it is very high.

Brands

• MATK% Spell or Divine.

Misc notes

• If using Killing Wind (Underside), then Concentrate only affects the initial hit, not the AoE chain.
• Consider transcending him for skill switches, as that lets him easily swap builds between multiple areas.

Team restrictions:

Difficulty	Restriction
Lv 3-5	3 or more demons must be fusible*.
Lv 6-8	4 or more demons must be fusible.
Lv 9+	All 5 demons must be fusible.
Lv 6+	1 or more demons must be grade 79 (4★ base) or lower.
Lv 9+	1 or more demons must be Clear .

Notes regarding fusibles:

• Multi-fusions count.
  • Beelzebub☆ counts, despite needing a gacha-exclusive material to make him.
  • For limited-time multi-fusions, only the ones that are currently-available will count.
• Pixie and Slime count, even though you cannot fuse them.

Sample party

Baal Skills Force Boost Back Attack Brands MATK% Divine or Spell Requirements -

Susano-o Skills Force Boost Force Amp Brands PATK% Divine or War Requirements -

Seth Skills Force Boost Master Assassin Brands PATK% Divine or War Requirements -

Oberon Skills Assassin Back Attack Brands MATK% Divine or Spell Requirements -

Mermaid Skills Mermaid (Underside) Killing Wind Brands MATK% Spell Requirements -

Team notes:

• Baal: 204 magic, has Force Amp, Purple has Merciless Blow, p1 has 20% damage. 50% team damage aura (20% at p0, 30% at p3, 50% at p4). 140 power single-target normal attack, and Tempest is a 140 power AoE that applies ATK Buff and DEF Debuff.
• Susano-o: 235 strength, has Assassin, Purple has Merciless Blow, p1 has 15% damage, p3 has 25% damage, p4 has 25% damage. Kusanagi is 200 power single-target, and applies ATK Buff.
• Seth: 248 strength, Purple has Force Amp, p1 has 15% damage, p4 has 25% damage. Ouas (160 power single-target with 50% crit).
• Oberon: 216 magic, has Force Boost, p3 has 10% damage. Zandyne (160 power single-target).

Other options worth considering:

• Cu Chulainn: 190 magic, P1 has 20% damage, P3 has 20% damage, P4 has 25% damage. Mazandyne (120 power AoE).
• Anubis: 217 magic, Purple has Merciless Blow. Transfer Zandyne + Force Boost.
• Titania: 235 magic, Purple has Back Attack. Transfer Zandyne + Force Boost.
• Long: 183 magic, has Force Boost, p3 has 10% damage. Zandyne (160 power single-target). Yellow has Concentrate.
• Garuda: 190 magic, p1 has 10% Force damage. Zandyne (160 power single-target). Innately has Auto-Rakunda to apply DEF Debuff.
• Loki: 198 magic, p3 has 5% damage. Zandyne (160 power single-target).
• Tsukuyomi: 216 magic, p3 has 5% damage. Zanma (140 power single-target). Needs Resist Phys. Can be re-used for the race challenge.
• Sandalphon: 170 magic (p1), has 10% damage on p3. Zandyne (160 power single-target).
• Isis: 148 magic, Purple has Back Attack. Zandyne (160 power single-target).

Team restrictions:

Sample party

Garuda Skills Merciless Blow Auto-Taruka Brands MATK% Divine Requirements -

Cu Chulainn A Skills Serial Killer Force Boost Brands PATK% Divine Requirements -

Cu Chulainn Skills Merciless Blow Force Amp Brands MATK% Divine Requirements -

Cleopatra Skills - - Brands - Requirements -

Tsukuyomi Skills Resist Phys Force Boost Brands MATK% Divine Requirements -

Team notes:

• Garuda innately has Auto-Rakunda to apply DEF Debuff. We have Auto-Taruka transferred to apply ATK Buff as well, providing a full buff swing.
• Cu Chulainn A: deals good damage with Barbed Spear.
  • His color does not really matter.
• Cu Chulainn: 190 magic, P1 has 20% damage, P3 has 20% damage, P4 has 25% damage. Mazandyne (120 power AoE).
• Cleopatra: casts Spirit Chains of Corrosion at the beginning of the battle, greatly reducing enemy defenses even at higher levels. Doesn't need a Force transfer, as she can simply skip her turn.
  • Her Reverse damage reduction in Peerless Beauty and Panel 2 don't work under Hell's Park Underside rules.
• Tsukuyomi: 216 magic, P3 has 5% damage. Zanma (140 power single). This skill costs 4 MP due to Lunar Blessing, meaning he can attack every turn if he has Divine brands, regardless of the enemy's MP draining.
  • He's weak to Phys, so he has Resist Phys transferred to cover it.
  • Damage-wise, he prefers using max-level Zanma plus a damage booster, over using Zandyne with no damage booster. Zanma can be leveled cheaply using 3★ fodder.
  • His color does not really matter, unless you specifically need more HP from Purple.

Other options worth considering:

• Garuda A: Good Force damage with Gale Talon.
• Izanami: 226 magic (246 with maxed Yomotsu Okami), has Merciless Blow. Will need a Force transfer. Her panels do not help a Force build, so you can use a p0 copy (or just unlock p2 for the +100 MATK).
• Norn: 193 magic, has Merciless Blow. Automatic cast of Luster Candy, and can do decent damage if given a Force transfer.
• Ishtar: 247 magic, Mesopotamian Star casts Luster Candy and Debilitate. Will need a Force transfer.
• Lakshmi: 248 magic. Will need a Force transfer (Twister isn't very good).
• Kurama Tengu: 134 mag. Zanma (140 power single).

Team restrictions:

Sample party

Mermaid Skills Mermaid (Underside) Killing Wind Brands MATK% Spell Requirements -

Harpy Skills Force Boost Serial Killer Brands MATK% Divine or Spell Requirements -

Susano-o Skills Force Boost Force Amp Brands PATK% Divine or War Requirements -

Cu Chulainn Skills Force Boost Force Amp Brands MATK% Divine or Spell Requirements -

Cu Chulainn A Skills Force Boost Serial Killer Brands PATK% Divine or War Requirements -

Team notes:

• Susano-o: 235 strength, has Assassin, Purple has Merciless Blow, p1 has 15% damage, p3 has 25% damage, p4 has 25% damage. Kusanagi is 200 power single-target, and applies ATK Buff.
• Harpy: 160 magic, 20% damage boost, p3 has 30% damage. 20% team damage aura on p2. Wind Trick (100 power AoE, +2 MP restored to party).
• Cu Chulainn: 190 magic, p1 has 15% AoE damage, p4 has 25% AoE damage. Mazandyne (120 power AoE).
• Cu Chulainn A: 201 strength, p3 has 20% damage boost. 10% Phys/Force aura and 10% AoE aura for the party. Barbed Spear is a 105 power AoE followed by 125 power random-target. Very high crit chance. If p3, applies DEF Debuff on the 1st turn.

Other options worth considering:

• Tengu: 100% crit rate boost. 30% damage boost. Has Wretched Blow. p1 has 20% damage, p3 has 30% damage. Yellow has 20% damage. 20-35% damage aura for the team. When going first, gives self Might and sets up ATK Buff and DEF Debuff. Tengu's Buddhist Might (100 power single-target + 100 power AoE, gives self Might, sets up ATK Buff and DEF Debuff)
• Kumbhanda: Souljack deals high-crit physical Force damage, and applies Spirit Chains of Corrosion to increase the team's DPS.
• Albion: Deals high damage based on PDEF. Purple has Wretched Blow. 15% damage from p1, 30% damage from p3. 30% damage aura for the team. Pure All-Out Ruin (200 power single-target, pierces bulwarks). Also has an Order Crest that frequently hits the lowest-HP enemy with a 100-power single-target attack (inscribes when an ally hits an enemy weakness, an enemy hits your party's weaknesses, or a party member is revived).
• Pendragon: 235 magic, 120% damage boost, p1 has 20% boost, p3 has 30% boost.
• Garuda A: 200 magic, has Force Amp, p3 has 25% Force damage. Gale Talon is 160-400 power random-target, pierces bulwarks.
• Schierke: 190 magic, 15% damage from p1, 15% damage from p4, 20% team damage aura from p3. 120-power AoE. If panel 2, applies ATK Buff on the 1st turn.
• Oberon: 216 magic, has Force Boost, p3 has 10% damage. Zandyne (160 power single-target).
• Titania: 235 magic, Purple has Back Attack. Transfer Zandyne + Force Boost.
• Anubis: 217 magic, Purple has Merciless Blow. Transfer Zandyne + Force Boost.
• Jack Frost with Jack Frost (Underside): 179 magic, Concentrate once (63% damage boost on average across 2 actions on first turn). Transfer Zandyne.
• Long: 183 magic, has Force Boost, p3 has 10% damage. Zandyne (160 power single-target).
• Garuda: 190 magic, p1 has 10% Force damage. Zandyne (160 power single-target). Innately has Auto-Rakunda to apply DEF Debuff.
• Loki: 198 magic, p3 has 5% damage. Zandyne (160 power single-target).
• Tsukuyomi: 216 magic, p3 has 5% damage. Zanma (140 power single-target). Needs Resist Phys. Can be re-used for the Genma race challenge.
• Sandalphon: 170 magic (p1), has 10% damage on p3. Zandyne (160 power single-target).

3★ options

• Lilim: 197 magic. Zandyne (160 power single-target) and Mazanma (100 power AoE).
  • Purple swaps out Zandyne for Magic Amp II instead.
• Isis: 148 magic, Purple has Back Attack. Zandyne (160 power single-target).
• Illuyanka: 175 magic. Zanma (140 power single-target) and Mazanma (100 power AoE).
  • Purple swaps out Mazanma for Magic Amp II instead.
• Unicorn: 185 magic, Purple has Serial Killer. Mazan (80 power AoE).