Falsehood

The False Knight in the Forgotten Crossroads - your first proper boss. He swings a huge hammer and slams the ground; when he over-swings and topples over, the maggot piloting the armour bursts out of the head - that's your window, pound the exposed head. Three rounds of it, with falling rubble between. Keep moving to dodge the slams and heal in the gaps. His harder dream form later gives Strength.