What would you make?
I think a challenging boss would be some kind of giant knight and when it's HP goes 50%, it splits in half and each half does double the damage, but their HP is pooled together into one so each half is easier to take down.
I think a challenging boss would be some kind of giant knight and when it's HP goes 50%, it splits in half and each half does double the damage, but their HP is pooled together into one so each half is easier to take down.