[atlatea]

Regarding set, i think at least 2 or 3 set always completed for most people in CW.

But even if you don't have the set, another item that compensate for it usually 90% spawn. In my case, whenever i don't have scale set, slipery cuiras and twinkling always spawn, especially slippery, and both of them often spawn together.

Though i never complete even composite set other than dragon toy (just once), and scrounger ring (twice).

Maybe it's just luck.

Regarding mage, direct damage spells is worth if you manage to at least score 50 int, best if you have 70 int, +spell dmg arties, destruction 3, just cast 2 black hole/geyser and most enemies at impossible will eat dirt. Or if you like, stack astral resistance and mana (minimum of 90 mana), have red/green dragon, then cast armageddon, then time back, most enemies should be very weakened, another armageddon will instantly wipe them and you incur loss.

There are no class that can win a fight in just 2 or 3 turn without losses except mage offensive spell caster type.

Downside is you need to scan your saves to achieve very high int and you need to rest after a battle to recover your mana. But really, winning battles in impossible in 2 or 3 turn is awesome.