Nether Graft: Add ranks to mutations for increased MP cost

[Stretch]

Suggestion: Allow WMs with Nether Graft to stack mutations (Ferocious, Defensive, Soak, Swell) multiple times.

Updating based on initial feedback, and thanks all for your comments!

Second tier of a mutation has the same incremental effect, but costs 35 MP.
Third tier of a mutation has the same incremental effect, but costs 50 MP.

Having Quick Mutations as well as Nether Graft alters it in the following way:
Second tier of a mutation costs 30 MP.
Third tier of a mutation costs 40 MP.
Fourth tier unlocked, costing 50 MP.

Mutations already cost a lot of MP for the extra increment of killing power you get, but this update would give WMs the ability to make some truly fun pets if they were willing to commit to expending a ton of MP.

[TheGoof]

If I'm going to the expensive and cumbersome effort of grafting pets, let me make something truly horrific, a real monster fitting of all the trapped leylines I had to tap to make such an abomination possible.

[NearNihil]

So kind of like the big zombie, but applied to any pet and you pay an exorbitant cost? I suppose that's not a bad idea. Even though they could be "donated" to a Corruptor (or Redeemed, I suppose) they're still mostly non-titan pets that for the most part die when the summoner does. I will say that I'd rather have it be an intentional thing rather than a free Quick Mutations thing (no going around beating up NPCs for super pets).

[Stretch]

Yeah I was assuming quick mutations would stay at the tier 1 mutation level. Although if additional coding logic could be added, would be nice to give a 50% chance of a tier 2 mutation if no other tier 1s were available.