Cooper Holt
Insider
Ohhh, you mean porky? The ogre?Yes pretty much like that; makes you think of what you're doing with your undeads, instead of just mindlessly summon as many as possible.
About piggy, well I just took a random number, and since piggy is a big badass, I'd guess being able to control one of those for a long time would be op. However, if the devs would like this idea, ofc they need to tweak the numbers so it's balanced.