Elemental Equilibrium

You create a 10 ft. radius circle of magical runes on the ground centered on you. The runes ignite with dim light when you finish casting the spell. You attune the circle to an elemental equilibrium chosen from the options below when you cast the spell:

• Acid/Poison
• Fire/Cold
• Lightning/Thunder

For the duration, any creature you designate at the time of the spell's casting can benefit from this spell's effect while within its radius. An affected creature has resistance to both damage types from the chosen equilibrium. Additionally, anytime an affected creature deals damage using a damage type from the equilibrium, they can change that damage to the other type from the same equilibrium pairing. The creature must choose to do so before rolling damage.