Aura of Life Leeching

This spell creates a 10' radius Aura around the caster marked by glowing Necrotic energy.  

Any creatures, friend or foe, that come within range must make a Constitution saving throw.  Upon a fail, they receive 2d8 Necrotic damage.  The caster also gains temporary hit points equal to the damage dealt.  

While in the aura you are unable to heal yourself by any means other than this spell. 

if cast by a Paladin the area of effect expands with their Aura of Protection.  Otherwise the default area is 10’.

Undead creatures are immune to this spell.

At higher levels.  The damage increases by 1d8 for every level above 1.