DnD 3.5. Level 10 Knight, Fighter, Spontaneous Theurge, Healbot Cleric, and level 9 Totemist. 4 Ambush Drakes show up with some kind of template that I'm not supposed to know about, but was supposed to make them CR 9 in total.

Theurge and familiar die to a breath weapon. Revivify is cast. Totemist gets pummeled to 0 HP and flees (kinda). Healbot hides in his bag of holding when at single-digit HP and about to get killed. Knight is Dexterity-damaged to 0. With over half his HP gone, the Fighter saves us with Cleave and a critical hit.

At the cost of 6,000 gp (familiar gets rezzed for RP reasons), we're back to normal, but that was a tough one.