Ranger Trap: Soul Bind

Prerequisite: 5th-level ranger; magical

When activated, there is a flare of brilliant octarine light, and each creature in a 20-foot-radius sphere centered on the trap must succeed on a Charisma saving throw or become soulbound, as per the preserve spell. In addition, while a creature is soulbound in this way, it can't benefit from being invisible. Creatures possessing robust or more powerful essence within their bodies (typically, those of CR 7 or higher) automatically succeed on this saving throw. You can expend a spell slot of 4th level or higher when you create this trap instead of a 2nd-level slot. When you do so, creatures with robust or less powerful essence (typically CR 11 or lower) must make the saving throw, while creatures with potent or more powerful essence automatically succeed.