Revert "Temp Invincibility (for real this time)"

This reverts commit 367e2d9b72faa680de032eb73c83e7b1ebcb8a97.
Difficulty Curb

Modified Level 01 to attempt to adjust a predictable difficulty curb.
New Bug: setting a static angle on Arcane Spawn always gives way to
unpredictable Arcane Blast Pathing