Another SliceHack feature. However, the math implemented by SliceHack
seemed incorrect, so I tweaked it.
Pets previously attacked monsters of up to one level higher than them as
long as they were above 25% health. Now, they will attack monsters as
follows:
100%: up to level + 2 (pets could not attack this high before)
80%+: up to level + 1
60%+: up to same level
40%+: up to level - 1
25%+: up to level - 2
The case that prevents any attacks below 25% health still exists.