New hero Baldric:
Survive endgame level 3 with 23 or more Arch Mages, or on Hell difficulty, to unlock Baldric.

Baldric spawns an elite skeleton every third attack, at the cost of Baldric losing 4% lifesteal during the level. If Baldric has 0% lifesteal no more skeletons spawn.
Lifesteal upgrade from +7% to +12%, you start with 12% lifesteal, and your ranged units and Baldric benefit from Lifesteal upgrade as well.
When you upgrade Baldric, or ranged units, your elite skeletons summoned by Baldric or Demon Synergy gain +3 base health.
You cannot use spells.
Also make sure to wishlist my upcoming auto battler game Doomed Dwarves:
