Investiture of Ice

Casting Time: 1 action
Range: Self
Duration: Concentration, up to 10 minutes
Until the spell ends you gain immunity to cold
damage and resistance to fire damage, you can
ignore difficult terrain created by ice or snow,
the ground around you becomes difficult terrain,
and you can create a 15-ft. 4d6 cold damage cone
as an action.
See XGE 159.