In my current game (playing as a custom faction based on Kingdom of Tarth), I got extremely lucky at the beginning of the game, although I didn't realize just how lucky at the time.

Around level 3/4, I picked up a Lightning Longbow, a weapon with Lvl 4 req, 9 damage, -4 initiative, and +2 lightning damage per level (so total damage at minimum level is 17).

My Sovereign is currently level 17, with an attack of 56: 34 from lightning, 9 base physical, 7 additional physical, and 6 fire.

With such high elemental damage, my DPS against anything not immune to lightning damage is insane. And that's when I'm shooting individual targets.

I think my best recent example was an Epic Troll Shaman spawn. A single, 5/56/32/110 champion against a 9-stack, ~336 HP enemy group. First attack, Rain of Arrows, dropping 5 enemy stacks in one go. 5 combat turns later, I'm victorious. I never moved. One stack of Troll Warriors attacked me, which missed (I also have 57 dodge).

I have gotten to the point where I consider moving to be as much a symbol of failure as actually dying (extremely rare! The last spawn type I found that could actually kill me was an Epic Corpse Spider group). I dealt with two Morian spawns by pruning his minions with cheap archers, then bursting Morian himself down with my sovereign and another archer champion who ALSO has a Lightning Longbow in two successive battles (Morian won the first = P).

Oh yeah, and I have a third Lightning Longbow waiting to be assigned. I converted Magar to a melee champion early-game, so he doesn't have Rain of Arrows and as such can't benefit from this insane synergy.