Prerequisite: Ability to cast a spell.
When you gain this feat, choose one of the following damage types: poison, psychic, necrotic, radiant, or force.
First, spells you cast ignore resistance to damage of the chosen type.
Second, all your spells that deal direct damage ignore their normal damage type and instead must use this damage type. You can suppress this effect by using a spell slot 1 levels higher than normal without the normal advantages for doing this.
Example: You have this feat (Necrotic) and cast Magic Missile as a 1st level spell, you get 3 darts that do 1d4+1 necrotic damage. If you want, you could upcast it to 2nd level getting either 4 darts doing 1d4+1 necrotic, or 3 darts doing 1d4+1 doing force.
Third, all your spells have cosmetic changes that reflect your chosen damage type. For example, a simple spell like Grease might look sickly and pale green, give a bad psychic vibe, be necroticly black, or radiantly white, or translucently force like. But it does not poison you, glow, or stop astral travel. Anyone observing you cast can make a DC 15 check as a bonus action to realize your spells are all of this type.
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