Rework Hidden Boss Pitch

Rework the movement and capabilities of the Hidden Monstrosity. -Passive Running or Hobbling to move and causing damage tremors. -Arena control or large AOE mob spawning, similar to the Jungle Monstrosity spawning hittable roots. -More animate falling or body throw attack. Multiple Phases (the fact that only the final MD2 boss had 2 phases made it special) Build a similar feature for the hidden boss