Force Keep guide: how to beat the Force Guardian at Stage 20

The Force Keep is where you farm the Potions needed to Ascend Force Affinity champions. Ascending adds base stats, unlocks Amulets and Banners at the required Ascension Levels and can improve some skills, such as unlocking passives. This guide covers the boss, his minions and a team that handles them.

When it opens

The Keep is normally available twice per week, on Tuesdays and Fridays. It can be opened on other days for 200 Gems, but that should be a last resort, for example if missing Potions would stop you Ascending the Epics you need before a Fusion deadline.

Aim for the highest stage you can clear consistently, eventually Stage 20. At that stage Lesser Potions drop out of the reward pool, leaving Greater and Superior Potions. If you need Lesser Potions for lower rarity champions, drop back to an earlier stage.

What the Force Guardian does

• Cripping Swipe hits all enemies with a 60% chance of a 50% Decrease ATK debuff for 2 turns. It cannot be resisted.
• Quake hits all enemies with a 50% chance of Stun for 1 turn. It also cannot be resisted.
• Force Armor raises his DEF to 4,000.
• Almighty Immunity makes him immune to most crowd control, including Stun, Freeze, Sleep, Provoke, Fear and Block Active Skills, as well as HP exchange, HP balancing and cooldown increasing effects.

The useful gap is that Decrease SPD and Turn Meter reduction still work on him. Slowing him while filling your own team's turn meters limits how often he can Stun or weaken your damage, and some teams can stop him taking a turn at all.

Minions and waves

Two minions fight beside him. The left one places Heal Reduction on your champions. The right one places Increase DEF on the boss. Kill or control them, use Block Debuffs or Remove Debuffs for Heal Reduction, and use Block Buffs, Remove Buffs or Steal Buffs against Increase DEF.

You also clear two waves first. Decrease DEF and Weaken speed that up, and Seer or Poison Explosion style teams can tear through both quickly. If you struggle to survive the waves, Stun, Freeze and Provoke on the regular enemies help.

A team framework

• Hoskarul is immune to Stun, can remove Stun from allies, and gives Increase RES and Increase DEF.
• Whisper is a strong Epic boss damage dealer when Decrease DEF and Weaken are on the target.
• Doompriest cleanses a random debuff and heals allies at the start of her turns, and brings Increase ATK. She suits Relentless builds.
• Stag Knight gives AoE Decrease ATK and Decrease DEF in one skill, and his A1 adds Decrease SPD.
• Deacon brings a Speed Aura, turn meter fills and AoE Decrease DEF.

Treat these as roles to fill from your own roster rather than a fixed list.

Building them

Aim for around 25 more ACC than the boss's RES, and check the exact numbers for your stage. Watch Affinity too: Magic champions are at a disadvantage here and can land Weak Hits, which stops debuffs attached to attacks from applying. Placement skills that need no hit are unaffected.

For damage dealers, prioritise 100% C.RATE, strong C.DMG and the relevant scaling stat. Perception, Pinpoint, Feral and Accuracy sets help debuffers reach their ACC, while Savage, Merciless or Lethal suit damage dealers against his DEF. Hybrids such as Michelangelo need a balance of ACC, SPD and offensive stats.