Feat: Soul Thief

Frequency once per day

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You attempt to steal the soul of a creature that was at least 18th level that died within the last minute. Attempt an Occultism check against the hard DC of the target's level. On a success, you capture its soul and solidify it into a gem that keeps the soul contained. While the soul is contained, it can't be returned to life through any means, even powerful magic such as the wish ritual. If a gem is destroyed, the soul is freed, and you become alerted to its destruction. You can maintain only three gems at any given time. If you attempt to make a fourth, you must choose a soul to be released.

You can consume a captured soul by swallowing a gem. Doing so grants you the unholy and undead traits and extends your existence by 50 years. You gain void healing, you aren't instantly destroyed when reduced to 0 Hit Points, and you can't be instantly killed by death effects. If you're destroyed, you can rebuild yourself in the location of one of your soul gems. This consumes the gem, and it takes 24 hours for your body to be rebuilt. If you are ever destroyed and are unable to rebuild your body, all souls that you have consumed are released.