Defeat Yama Ja-Aku Frost in Shin Megami Tensei III: Nocturne HD Remaster

Q: How to beat YAMA JA-AKU FROST?

Yama Ja-Aku Frost is a tough optional boss who reflects Ice and Fire, is strong to Physical, and immune to most status effects. Focus on Shock and Electricity attacks, and use buffs/debuffs to survive and deal damage.

Q: YAMA JA-AKU FROST weaknesses?

Yama Ja-Aku Frost is a tough optional boss who reflects Ice and Fire, is strong to Physical, and immune to most status effects. Focus on Shock and Electricity attacks, and use buffs/debuffs to survive and deal damage.

Q: YAMA JA-AKU FROST resistances?

Yama Ja-Aku Frost is a tough optional boss who reflects Ice and Fire, is strong to Physical, and immune to most status effects. Focus on Shock and Electricity attacks, and use buffs/debuffs to survive and deal damage.

Q: Best skills against YAMA JA-AKU FROST?

Yama Ja-Aku Frost is a tough optional boss who reflects Ice and Fire, is strong to Physical, and immune to most status effects. Focus on Shock and Electricity attacks, and use buffs/debuffs to survive and deal damage.

Q: YAMA JA-AKU FROST HP and MP?

Yama Ja-Aku Frost is a tough optional boss who reflects Ice and Fire, is strong to Physical, and immune to most status effects. Focus on Shock and Electricity attacks, and use buffs/debuffs to survive and deal damage.

AntMag.NET

Stats / Weaknesses:

HP: 2950
MP: 2500
Affinity: Boss Immunities, Reflects Ice, Fire, and Curse, Strong to Physical
Skills: Mahabufudain, Mahamudo-on, Rampage, Diarama, Bufudain
Weaknesses: Shock, Electricity (and All-purpose, if you have it)
Resistances/Immunities: Reflects Ice, Fire, Curse. Strong to Physical. Immune to Hama, Mudo, Nerve, Mind.

Phases:

Yama Ja-Aku Frost starts the fight with its full arsenal. Its most frequent attacks are Mahabufudain and Mahamudo-on.

Strategy:

This guy is no joke, a much tougher version of your typical Jack Frost. He's big, he's mean, and he hits hard. Don't bother with physical attacks; he's just too strong against them.
Your best bet is to exploit his weakness to Shock and Electricity. If you have any demons that specialize in these types of attacks, bring them along!
Fast and Dangerous Method: Your goal here is to survive long enough to boost your magic stats as high as possible. Then, unleash your strongest Shock and Electric skills. You'll definitely want at least one demon that's immune to Curse and another that's immune to Ice to counter his double-threat attacks. Use skills like Tetraja and Makalakarn to protect against curses, and Maka-Kaja to boost your own magic power. Don't forget War Cry to lower his attack power and a dedicated healer to keep your party alive.
Slow and Safe Method: This method requires some setup for your Hero. Make sure your Hero has Ice immunity or absorption, and the Drink Magic skill. Equip Anathema on your Hero to completely negate Ja-Aku Frost's curses, leaving you only vulnerable to his Rampage attacks. The core of this strategy is to use Drink Magic repeatedly until Yama Ja-Aku Frost is completely out of MP. This will take a very long time, given his massive 2500 MP pool, but it's effective. You can speed this up by using Maka-Kaja on yourself. Once he's out of MP, summon your allies and wail on him. If you had Arahabaki earlier in the game, you can re-summon him to pester Ja-Aku Frost, as Arahabaki is immune to everything this boss can throw at him.
Remember, Yama Ja-Aku Frost is an optional boss, so if you're really struggling, you can always come back later when you're stronger.

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BOSS: YAMA JA-AKU FROST