Spell Trickster

Your experience with magic and its traditions lets you specialize in the casting of certain spells, customizing familiar spells to create novel effects.

• Increase your Intelligence, Wisdom, or Charisma score by 1, to a maximum of 20.
• When you select this feat and during a long rest, you may pick two of the following spells to augment. Each time you cast a spell corresponding to the feat you chose, you decide whether to cast its normal or modified version. This feat only augments spells that you know or have prepared and does not grant you the spell for selecting the modification. You can only apply one modified spell at a time, and a subsequent casting of a second modified spell ends the previous one. Besides modifications mentioned in the feat, the spell functions as normal.
  • Shield: When you cast Shield, you can modify the spell to create an arched barrier you can use for half-cover
  • Light: When you cast Light, you may select to target one melee weapon within range. When that weapon successfully damages an opponent, you may choose to use your reaction to cause the light spell to end. Both the creature taking damage and the wielder of the melee weapon must make a CON saving throw equal to your spell DC or be blinded until the start of your next turn.
  • Dancing Lights: When you cast Dancing Lights, you can modify its duration to be 1 minute and modify its standard effects to create a single floating light in the shape of a Tiny creature, instead of up to four floating lights. The creature hovers over your head unless you spend a bonus action to direct the light to move up to 30 feet. The light is ephemeral and does not have a physical form to interact with objects. If the light ever moves beyond 120 feet of you, it winks out immediately.
    
  • Mirror Image: When you cast Mirror Image,  you can modify its duration to be 1 minute and modify its range to 30 feet. If you do, replace the spell's standard effects with the following: You create a single illusory duplicate of yourself that appears in an unoccupied square within range. The image takes up space and has a reach of 5 feet, and your allies can flank with the image. You can use your bonus action to direct the image's movement up to 30 feet. If the image is hit by an attack or fails a save, or if you ever move more than 30 feet from it, the spell ends. Creatures can move through its space without hindrance. If a creature ends its turn on the same space of the image, this spell ends.
  • Tenser's Floating Disk: When you cast Tenser's Floating Disk, you can modify its duration to be 10 minutes. If you do, you adjust the weight to be you plus enough weight you can carry before becoming encumbered. You may ride on the disk and use your bonus action to move the disk up to 30 feet, though it never extends above a height of 3 feet off the ground. While you ride atop it, the disk can move over liquids as long as it ends its movement on solid ground. If it ends its movement on a surface that can't support it, the spell ends.
  • Fog: When you cast Fog, you can modify it to extinguish any non-magical fire within the area.
  • Grease: When you cast Grease, you may select to have the spell select one target within range. If you do, that target must make a DEX saving throw. On a failed save, that target has weakness to fire until the end of your next turn. A creature may use an action to scrape off the grease, ending the spell.
  • Fireball: When you cast Fireball, you may modify it's area to be two non-overlapping 10-ft radius circles.
  • Vampiric Touch: When you cast Vampiric Touch, you can modify its standard effects as follows: Instead of gaining the temporary Hit Points yourself, you can grant the temporary Hit Points to an ally within 30 feet.