Rainbow Aura

Natural flora and fauna are colorful and use those colors as signals to defend themselves. You do likewise, albeit somewhat more proactively.

You increase your Constitution ability score by 1 up to a maximum of 20. In addition, up to three times per long rest, when you successfully hit on an attack, you may roll an additional 1d6. The result on the die determines the additional damage of the attack as follows:

Result	Effect
1	You do cold damage equal to your Constitution modifier (minimum damage 1).
2	You do fire damage equal to your Constitution modifier (minimum damage 1).
3	You do acid damage equal to your Constitution modifier (minimum damage 1).
4	You do psychic damage equal to your Constitution modifier (minimum damage 1).
5	You do necrotic damage equal to your Constitution modifier (minimum damage 1).
6	You do radiant damage equal to your Constitution modifier (minimum damage 1).

If the original roll to hit was a critical success, double the amount of additional damage dealt via this feat as well.