Catastrophist

Max Lightning. The catastrophist calls down a lightning storm in a 50x50 foot square. All creatures caught in the radius must make a DC 15 WIS save taking (8d8) Lightning damage on a failed save and half as much on a successful save. 

Big Boom. The catastrophist lobs a giant bomblike swath of fiery arcane magic. The bomb explodes out in a giant 120 foot radius circle. All creatures in the radius must make a DC 16 CON save or take (10d10) fire damage on a failed save or half as much on a succesful one. The entire ground is now covered in flames, all creatures starting their turns in this radius take 8 fire damage at the start of their turn. 

Necrosis Bomb. The Catastrophist creates a swirling green vortex and detonates it at a point letting it spread out in a 20 foot radius circle. All creatures in this circle must make a DC 14 CON save or take (6d6) Necrotic damage or half as much on a successful save. 

Freeze Bomb. The catastrophist freezes the air in a 45 foot square dealing (4d8) cold damage to all creatures in the area. Each creature hit must then make a DC 14 CON save or become exhausted. 

Force Bomb. Upon death, the catastrophist plays one last trick, it self detonates dealing (2d12) Force damage to all creatures within 80 feet of him. Each creature hit must make a DC 18 STR save or be knocked 35 feet backwards and prone. The creature taking the final blow must make a DC 15 Perception check to sever the body from the bomb, the bomb still explodes but the body remains.