Minor Update/Bug Fixes (V1.16)

- Reduced the base volume of all sounds and music by 20%.
- Fixed missing tiles and shadows on some maps.
- Fixed incorrect damage/other values of various weapon modifiers in co-op.
- Fixed a bug in co-op where having 2 or more paladins/priests would break their weapon modifiers.
- Fixed a rare bug that caused certain projectiles to get stuck in walls.