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Scabbard of the Fallen Abomination


Back in 2017, one of our homebrew rpg groups had a homebrew challenge. One of those is creating a weird magic, which can be a spell, effect, or an item, that is 5E compatible. This was my entry back then, but I expanded on it a bit, adding agenda and fear. Posting it here for posterity, and possibly improving it to be a system-neutral item/loot.

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Image: my rendition of the scabbard's appearance 

Image: a transformed sword, becoming a sentient arm


Inspiration: Morty's Giant Arm (Rick and Morty s03e02) + Tentacle Swords.


SCABBARD OF THE FALLEN ABOMINATION
Wondrous item, rare (requires attunement)

An old scabbard made from wrinkly leather. This scabbard can shrink or enlarge to accommodate any knife, dagger, sword, or similar weapon up to and including a greatsword. With a command word, any sheathed weapon drawn from this scabbard turns its blade into a long and deceptively scrawny arm attached to a hilt of a greatsword. The "arm" blade's damage die becomes 2d6, and it deals bludgeoning damage instead of normal. It gains the reach and two-handed property.

While wielding the transformed weapon, you are considered to have a Strength score of 20 when using the "arm" blade for attack rolls, damage rolls, saving throws, or skill checks. Only the attuned character is proficient with the transformed weapon.

The abominable arm is sentient, and will attack anyone except the wielder of the scabbard if unattended. It will always try to crawl back to the wielder, fighting its way if it has to.

It has its own agenda and fear. It can communicate by transmitting emotion to the wielder of the scabbard.

Agenda
1 - Find the other pieces of the fallen abomination
2 - Attach itself to a suitable body
3 - Offer tribute to its wielder
4 - Seek its creator
5 - Vengeance against the abomination killer
6 - Convince people to worship it/the wielder

Fear
1 - Fire/Heat
2 - Rust/Acid
3 - Cold/Ice 
4 - Light
5 - Electricity
6 - Ocean/Large bodies of water


The weapon returns to normal after 1 hour, when a new weapon is sheathed on the scabbard, or when the scabbard is destroyed.


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