DF giants

[weby]

Single/few 6d to 8d damage hits are fully survivable for the heavy frontline types in DF if they have even slightly upgraded gear and such. The light front line combatants will fare less well if hit.

One on one: yeah they would not like it, but given a bit of support from the rest of the party the heavies will do fine. If there is a mage they can reduce the hit probability a lot, a cleric can heal them, a scout will make the fight much shorter making for less hits and so on.

I regularly use heavy hitters as one of the threat types in my current fantasy campaign. In a regular DF power level campaign the threats will of course have to be a lot lower powered than I use, but a creature of the indicated damage potential and fairly low skill likely makes for a challenging but not overwhelming encounter.