Energy Resistance - Truespeech

You speak an utterance that causes the element of your choosing to bend to your will. When you speak, you grant the armor/clothing of the target resistance to fire, cold, acid, or thunder damage for three turns. When you speak this Utterance in reverse the target is suddenly imbued with your choice of fire, cold, acid, or thunder and takes 25 points of the chosen damage. The target may make a Constitution or Charisma saving throw for half damage (rounded down). In order for this to work, the speaker must roll a 13 or higher with their INT modifer.