
Your damaging spells cause excessive pain. Add double your current Warlock spell slot level to the DC for the target's concentration saves to maintain concentration. Cantrips also add the current warlock spell slot level. This pact does not increase the actual damage done, only the DC to maintain concentration as a result of the damage.

This is not intended as a feat but as a new Warlock Pact. Since there is not option to add Warlock Pacts on DnD Beyond it is being presented here as a feat.
While this pact can be used by any warlock patron it was design in mind for the homebrew Succubus / Incubus patron.
There are five new Warlock Invocations that were created along with this pact (also implemented as feats in DnD Beyond), four of which are Pact Of Pain only.