I have picked a tanky fighter with lone wolf, and a ranger without to get a healer onboard. Now my healer is also a geomancer + pyrokinetic + hydrosophist (last one is logical) (summon + poison + BOOM!). It is to be said i only play on normal, but when that is said, my tank never dropped below 50% health, since most enemies tend to focus on summoned creatures only... This means that you can just use him as pure DPS instead.
All you relly have to worry about is spells (and they can hurt if they use teleport, and lava is neaby) I do not know if behavior is changing on higher levels of difficulty, but this is my experience...
As soon as I am done with this playthrough im going to start a four peops team instead for that extra BOOM
