worshiper of the great explosion

after seeing the first display of ash and sulfur you were in awe, needing it needing to understand just what you saw.

EXPLOSION

consume all available spell slots and roll 1d4 per spell slot consumed, the damage dice for this upgrades at level 5, 11, 17. upgrades up the type of damage dice like 1d4 to 1d6 ect 
this spell has line of sight range and a AOE of 20ft, creatures in this area  make a saving throw dc is spell save dc, on a success targets take half damage.  

all in

you now count your arcane recovery as spell slots for the purpose of EXPLOSION

ashes of rest

During a long rest, choose if your next explosion deals fire or force damage. Can only change damage type DURING a long rest

sensitive nose

You have advantage on perception checks when smelling\ using your nose