How OP would (in General)

A Decay familiar be?

Considering that the part of decay that grows when you train it is it's resistence to AMF you'd have a mage familiar that was pretty much invulnerable to AMF at higher levels but unable to kill anything.

Would probably be better coupled with some other ability. Dunno what though.

Jiraiya...who exactly would this benefit?

Wouldn't it just be easier to train decay and use some NSCs?

:D I dunno, flavor? just seems it's the only thing that doesn't have it's own familiar!

Could call it an Undead Familiar or something?

Me thinks it'd be pretty useless though, but maybe someone could think of one.

i have wanted a lifetap familiar for some time. make it use decay but return a portion of the life drain to the wearer. woot for lifetap!

Dead Man of Dunharrow!

I thought I'd posted about something like this a very long time ago... Tattoo ideas?