I do not understand why a monster who is immune to Possession can still be corrupted when they are basically the same skill with different names. It is really frustrating to have a monster immune to possession but it can still be corrupted

Possenssion, corruption, and hack have the same affect. Re-branding it with a new name gives SP the ability to make it look like a new shiny skill without having to develop something new. Same thing applies to bypassing immunity. They have done this to many skills/affects: burn & incinerate are another example.

@Keith-Romberg I know but it still doesn't make it right. :P Is that what they call it rebranding lol...