I don't want to sound like a whiner, but with my current skill level this challenge does not seem even vaguely feasible.
Some of the silver challenges are quite daunting, which is unfortunate since they gate some of the best items in the game. The Trisword, Platemail, Gloves of Midas, Agnostic Collar, and Vampiric Blade are all awesome items that you definitely want in your shop rotation, but some of them are crazy difficult to unlock.
As for Warlord Silver in particular, the IMAWAL glyph always spawns. Use this to turn the revenants to stone and don't bother fighting them; they aren't worth XP anyways. You can also use the "entanglement" boon from the Earthmother to cancel out their first strike, and if you deal enough damage you can then kill them in a single blow.
Per my usual recommendation for Hexx Ruins, focus on fighting higher-level monsters and ignore low-level ones if at all possible. Generating one or two really strong revenants isn't a big deal, since on their own they can't block your way. Generating half a dozen weaker ones can really wear you down, and this is more acute than usual on Warlord Silver.