Heroes Beware

The heroes have come to loot your dungeon. They picked the wrong one. You command the monsters. Drag two matching creatures together and they merge into something worse — 50 tiers across ten bloodlines, from a Toxic Slimeling to the Endbringer itself. Five elements: Venom, Fire, Ice, Lightning and Dark. Place them well and they bond — Fire beside Venom detonates your poison, Ice beside Lightning freezes heroes solid for critical hits.