Paladin Ability - Radiant Blast

While the divine magic of a Paladin can be healing and a blessing, it can also destroy the life of others, as an additon to being able to bring friends and allies back from the brink, it additionally has the power to push others over it.

As an action, you can touch one creature within reach and use 5 health from your Lay on Hands pool to create a blast of radiance within their life energy. This creature must make a Constituion saving throw equal to your spell save DC, on a fail; they take 1d4 radiant damage for each 5 HP used, on a success, they take half damage.

The maximum amount of health that can be used for this blast is 50, which does 10d4 radiant damage. This feature cannot be used if your pool of health is lower than 5.

Undead and Fiend targets take an additional 1d4 radiant damage.

This attack has no effect on Constructs.