IMPORT (evktalo): Poison susceptibility for Spider Form.

 Doubles the amount of poisoning (duration, and therefore damage) status. No extra damage from clouds/Poison Arrow etc. Increases rest-off time (which can be tedious), but increasing the duration instead of damage makes it so you can't just switch forms after the poisoning and shrug off the vulnerability.

 Two sources of rP do not bring you back to positive rP, but one does return you to non-negative resistance.