Abilities: Increase from the base creature as follows: Str +4 (+2 to attack and damage, +2 to Climb and Swim skill checks, +2 to Strength, and CMB checks, +2 to CMD, +2 to the DC of any of the creature’s Strength-based DCs ) +4 Con (+2 to Fort, +2 hp per HD, +2 to any of the creature’s Constitution-based DCs).
Corrupted Damage (Ex)
If the base creature deals damage, half the damage dealt is as normal for the base creature, but the other half results directly from the corrupting power of shadow and is therefore not subject to being reduced by resistance or immunity.
ALT: Reskin the promethean corruption template to be Shadow-based.