Gauntlet Dark Legacy/Toxic Spire

On the Boat Kill the general attacking you, but be careful not to blow up any of the red barrels. At the other end of the boat grab the anti-death out of the left barrel and turn it on to steal health from death.

Arriving on land Kill the ankle-biters, then kill the grunts and destroy the generator at the far end. Note they have gas masks so the poison barrels don't affect them.