Channel Energy

An aura of energy emanates from a point you choose within range of either positive or negative energy in a 20-foot radius. Creatures within that radius may make a Constitution saving throw. If they succeed they receive half healing/damage. A creature my choose to fail.

Constructs are unaffected

If positive energy is chosen the following effects apply: Living creatures receive 2d6 healing, undead take equivalent radiant damage.

If negative energy is chosen the following effects apply: Undead creatures receive 2d6 healing, living creatures take equivalent necrotic damage.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st.