'Lava Walk' Spell

|  Level: 6th  |  Casting Time: 1 Action  |  Range/Area: 30 ft.  |  Components: V, S, M (a piece of lava rock and fire)  |  Duration: 8 Hours  |  School: Transmutation  |  Attack/Save: None  |  Damage/Effect: Buff; Movement  | 

This spell grants the ability to move inside lava as if it were harmless. Up to ten willing creatures you can see within range gain this ability for the duration. 

You and up to ten willing creatures you can see within range assume a molten lava form for the duration, appearing as lava. While in this lava form, a creature has a speed of 300 feet and has resistance to damage from nonmagical weapons. The only actions a creature can take in this form are the Dash action or to revert to its normal form. 

Reverting takes 1 minute, during which time a creature is incapacitated and can't move. Until the spell ends, a creature can revert to lava form, which also requires the 1-minute transformation. 

Creatures will transform into lava itself, meaning that if the lava form cools, the creature will also cool and turn into hardened rock. If the lava form rock form is shattered, the creature will automatically die.