As part of an accident, experiment or willingly injected, your arm has been torn up and had arcane crystal shards placed inside your arm. After some time of adapting and attuning to this magical energy you can sense wild magic surge throughout your arm and your body. Your spells grow more powerful when you use this arm and chaotic events tends to happen around you.
You can channel arcane power through the crystal shards for free a number of times equal to your proficiency bonus. All uses are regained on a long rest.
You gain an evolving arcane focus in your crystal infused arm starting with a +1 when you roll to hit and a +1 to your spell save DC while casting spells using this arm as your arcane focus. This increases to a +2 when you reach level 6 and a +3 when you reach level 14. When you reach one of these milestones, switch this feat out for the higher level one.
Cursed Focus. You cannot willingly destroy or remove the crystal shards and you are considered attuned to them as long as the shards are in your possession.
Heal or Harm. Every time you channel arcane power with the crystal shards as a focus there is an equal chance that the power unleashed heals you or harms you. If the to hit roll, healing roll, or saving throw is an even number, you heal a number equal to the damage dealt, and if it's an odd number, you take damage equal to the damage rolled. This trigger once per target per turn, if there are more than one target.
Chaotic Surge. The increase in power that the crystals grant come at a price. Every time you channel arcane power with the crystal shards as a focus, the arcane magic becomes unstable, causing a Wild Magic surge. Roll a d100 and consult the wild magic surge table.
Crystal Overcharge. When you have used up all your charges equal to your proficiency bonus, you can keep pushing your luck and use this feature more. However, whenever you do so, roll a d100 and consult the effects below as the crystals overcharge with wild magic.
1 - Creates an arcane explosion forcing everyone in a 50ft radius centered on you to make a dexterity saving throw DC 20 minus your Spellcasting modifier. On a failed save this explosion deals 6d10 force damage and pushes everyone 10ft outside the radius or half damage on a successful save, still getting pushed to the edge of the radius.
2-99 - Creates another wild magic surge.
100 - Makes the triggering spell deal tripple damage.
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