[Balance] Obsidian Golems should have 'Impenenatrable'
Impenatrable would be a trait that allowed incoming damage to be reduced to zero, rather than maintain a mimimum of 1. Obsidian golems should probably gain magic damage reduction based on their magic resist (all units probably should). Barring this they should take zero damage from fire, cold and half from lightning.
This should probably be granted to Earth Elementals and Dragons in addition to being selectable as a path of the defender trait.
Alternatively all damage that hits for 1 should have a chance to be reduced to zero based on the armor of that unit.