Defiled Costa (Greater)
Activate ◆ envision
This still-bloody rib was taken from a priest of Urgathoa at the moment they passed into undeath and has a constant stench of decay. The first time any creature critically fails its saving throw against a Mask of Terror spell cast using this catalyst, it also takes 6d10 mental damage, with a basic Fortitude save against the spell's DC, as it lives through the memory of having its rib torn from its body. A creature who critically fails against this safe is killed instantly. This effect has the incapacitation trait.
Once any creature takes this damage, the defiled costa's effect ends, and no other creatures take the damage, even if they critically fail.
Traits
Items that have the catalyst trait are consumable material spell components that alter or magnify specific spells. Activating a catalyst is part of Casting the Spell. The catalyst might increase the number of actions required to Cast the Spell, as indicated in the catalyst's Activate entry. Additionally, the spell gains the manipulate trait if it didn't already. Because the catalyst becomes part of the spell, you can draw the catalyst as part of Casting the Spell.
An item with this trait can be used only once. Unless stated otherwise, it's destroyed after activation. Consumable items include alchemical items and magical consumables such as scrolls and talismans. When a character creates consumable items, they can make them in batches of four.
Something with the magical trait is imbued with magical energies not tied to a specific tradition of magic. Some items or effects are closely tied to a particular tradition of magic. In these cases, the item has the arcane, divine, occult, or primal trait instead of the magical trait. Any of these traits indicate that the item is magical.