Vulnerability
Flaw, Innate, Selection
Cost -5/tier if the selection is rare, -10/tier if the selection is uncommon, and -15/tier if the selection is common
Selection Choose a substance, condition, or phenomena that harms you that wouldn't harm most creatures.
When exposed to your vulnerability as an environmental effect, you suffer an environmental hazard with a tier and severity of trivial. This increases to minor at tier 2, moderate at tier 3, major at tier 4, and deadly at tier 5. Each additional tier imposes an innate penalty to your saves against this environment equal to (Tier -5).
If the vulnerability is a substance then you take (Tier) damage each round you touch it. If struck by a weapon made of this substance, you take (Tier) additional damage. If splashed with this substance you take 1d6 + (Tier) damage of a type specified by you (but you can never gain resistance to it from an innate ability). If partially submerged in the substance this increases to 1d10/Tier per round. If fully submerged in the substance, this increases to 1d10+10/Tier per round.
Cursed (+1) Your vulnerability is a curse. Add the Curse type to this ability. Any attempt to grant you resistance, immunity, or protection from your vulnerability is automatically countered by this curse with a bonus to countering equal to 5 + triple this ability's tier. If the counter fails, it attempts to counter the protection again 1d4+1 rounds later.