Sonic Boom
Tier 1 Epic evocation
Casting Time: 1 action
Range: Self (60-foot radius)
Components: V, S, M (a storm giant’s death rattle, magically preserved in a glass jar)
Duration: Instantaneous
You clap your hands and unleash a deafening wave of thunderous energy in a 60-foot radius centered on you. Creatures other than you in that area must succeed on a Constitution saving throw or take 20d6 thunder damage and be blinded and deafened until they regain at least 1 hit point from magical healing. A successful saving throw halves the damage and prevents the blinded and deafened conditions.
If this spell is cast in a structure or enclosed space that is not large enough to accommodate the entire 60-foot radius, it deals an additional 20d6 thunder damage and you are subjected to the spell’s effects.
Ref: ELCR p103