Fleshwrit Carapace is a Unique Chest Armor in Diablo IV Season 15. It comes from Lord Zir (Lair Boss loot table); Lord Zir (Lair Boss loot table, boosted class-unique drop).
Unique power
Sigil Skills deal [70 - 90]%[x] increased damage. Active Sigils gain 1 kill every second and unused kills are saved when they expire.
Affixes
Willpower
Armor
Where it drops
Lord Zir (Lair Boss loot table)
Lord Zir (Lair Boss loot table, boosted class-unique drop)