Pact of the Scavenger

    I'm of a mixed opinion when it comes to fifth edition - mostly running it due to Player interest - but one of the aspects of it that most intrigued me was the direction that they took Warlocks. I especially found the Pact boon interesting, since it's fairly easy to build new invocations off of the back of it. This boon was originally for a player in my 5th ed campaign who was playing a sort of chirugeon who focused on trying to harvest organs from supernatural creatures. The player was fairly fastidious about gathering the organs, but a little less so about actually using them.

Pact of the Scavenger

Your patron has given you the ability to find power in the corpses of creatures with natural magical gifts. Searching through their bodies for the organs that power their fantastic abilities, you can use your grisly trophies to ape a small shadow of their power. The warlock can make a Medicine or Arcana roll (DC 15) when searching through the body of a slain creature to successfully excise some mystically important piece of it off for later use. Valid targets must have the ability to either naturally cast spells or have something akin to a spell-like ability; spell-casters do not count as valid for this purpose. Through a 1-hour ritual the Warlock can draw the power out of the organ and use it to cast a 1st level spell a single time at any point afterwards during the next week as they would any other spell. The spell must be chosen at the time of the ritual, cannot be changed and is cast at the Warlock's level when it was crafted. Only the Warlock may use these talismans. A Warlock with the Scavenger Pact can carry a number of active talismans on them equal to their Intelligence bonus.

Image: Wound man, Pseudo-Galen, Anathomia; WMS 290, Sourced from Wikimedia Commons.