Large monsters

[edipox]

I'm not sure if it would be hard to implement this.. but it would be pretty awesome to have some bosses that are larger versions of existing monsters, for example, a giant wyvern.

[dorkster]

FYI, the main bosses in the Empyrean Campaign are about 1.5x normal size. There are a few caveats as creatures get bigger than that:

• For path finding purposes, creatures occupy (i.e. block) one tile at a time. So having them navigate narrow passageways can look weird. Not such a problem if the arena is big and open.
• Since only one tile is blocked, the player can get really close to the center of the enemy. I think adding a radius variable as a "hitbox" for creatures would be a good solution. We could then push the player out of they intersect with a large enemy's hitbox.

This is definitely something I want to attempt for #739, at least for the final boss.