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Smirk

A demon has a 50% chance to Smirk after it lands a critical hit or nulls, repels or drains an attack. Any ailment stops Smirk and removes it.

What Smirk does in IV: Apocalypse

EffectDetails
Every attack hits and critsmagic, Almighty, Light and Dark included; attack buffs count as maximum
No weaknesseshits on the demon's weaknesses and crits against it count as normal hits
It laststhe demon keeps Smirk when it is hit; one Pass keeps it too, the next action ends it

Some skills do more while Smirking: Hama and Mudo can kill outright,

Trisagion pierces resistances, Antichthon debilitates its targets, Salvation also cures every ailment. Smile Charge makes the user Smirk, and Magaon removes Smirk from an enemy.
Fan-made, non-commercial. Shin Megami Tensei is © ATLUS / SEGA. Data from megaten-fusion-tool.