The Elites selection may be 'boring' and competitive, but most people would say the HQ and Heavy slots weren't.

Tervigons want the power what gives Feel no Pain (Catalyst?). Dealing with 30 Gaunts in cover can be a pain, but it isn't that difficult, but dealing with 30 Gaunts with cover and Feel no Pain... yeah, that's significantly more tricky. It can also be cast on the Monstrous Creatures to give them a defence against AP3 weaponry.