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Backdrop: A horror-themed campaign that heavily draws upon the Lovecraft mythos, using the Dungeons & Dragons 5th Edition ruleset.

Situation: The party has encountered a story arc inspired by the American folktale of the Jersey Devil. An NPC is currently pregnant with an aberration; the party has used various magical abilities to successfully divine the gestating creature's true nature. Thanks to previous incidents being recorded in the town's charter, the party knows that giving birth to this creature will be fatal to the NPC and the creature itself will be dramatically more difficult to deal with.

The party has access to high level arcane magic (but not the Wish spell) and wants to find a way to safely separate the NPC from the aberration growing within her. Even in its current state the aberration could pose a threat if disturbed via surgery. The idea has been posed to try using a spell that targets only the NPC, specifically the Banishment spell - sending the mother to a harmless demiplane while the aberration can be collected and dealt with, without risking harm to the NPC.

With the above details in mind, could the Banishment spell (or something similar) be used to separate the NPC from the aberration, such as by banishing just one or the other, while adhering more or less to Rules as Written?

"What happens to swallowed creatures when banishment is cast on the creature that swallowed them?" covers a similar topic, but the circumstances are different in that this is not a creature that has been swallowed; the creature is actively growing inside the NPC.

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marked as duplicate by Dale M dnd-5e Dec 13 '18 at 7:32

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    \$\begingroup\$ How is this not a dupe of that question, or the pregnancy one you just asked? \$\endgroup\$ – KorvinStarmast Dec 12 '18 at 23:01
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    \$\begingroup\$ The original addendum scenario to the pregnancy question asked if the starspawn alone could be targeted for banishment separate to the mother/host. Although it sounds like in this version you intend to banish only the mother, and leave the starspawn behind unbanished. You don't ask about doing that clearly here, but do you mean to ask if you can specifically target banishing just one or the other in this kind of scenario? \$\endgroup\$ – doppelgreener Dec 12 '18 at 23:10
  • \$\begingroup\$ Yes; the question is can you target the NPC without also targeting the aberration, or vice versa. I feel the original question did not give enough context; this is not an attempt to remove a typical fetus from its mother - this is trying to remove what is ostensibly an invasive species from its host. I believe this is also a different situation than just being swallowed whole, as in this case the two creatures share a physical connection beyond one simply eating the other and keeping it stored in its stomach. \$\endgroup\$ – Mimics Everywhere Dec 12 '18 at 23:19
  • \$\begingroup\$ Thanks, I've revised this to be a bit clearer as to what you're driving at there. I think this is OK to reopen as it's a substantial scenario you're specifically trying to resolve, and not a generic "is it safe for a pregnant individual to be banished" question. \$\endgroup\$ – doppelgreener Dec 12 '18 at 23:35