Sequestered Soul (5e Creature)
From D&D Wiki
Tiny undead, lawful neutral
Damage Resistances bludgeoning, piercing, and slashing from nonmagical attacks that aren't silvered
Incorporeal Movement. The soul can move through other creatures and objects as if they were difficult terrain. It takes 5 (1d10) force damage if it ends its turn inside an object.
Scent of Wealth. The soul can detect the presence of gold and other precious metals, such as silver and platinum, within 30 feet of it.
Unnerving Touch. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 1 necrotic damage.
Mercantile Goods. Sequestered souls are summoned by soul merchants—the souls of creatures that had debt to them when they died. They have a number of uses, such as acting as guards and sentries of soul merchant camps, or scouting out the area through which a soul merchant family intends to travel, to check that there are no dangers in the way. The ritual that's used to summon a sequestered soul traps the spirit within a gold coin—it's from this process that the spirits get their name, as the soul is hidden within the gold to create the spirit.
Soul Standard Sequestered souls are actually a form of currency. They maintain something which the soul merchants know as the 'soul standard'—which bases the values of all material wealth on the value of a soul. Soul merchant families will occasionally trade sequestered souls among one another, and the number of sequestered souls a family has to its name is used as a status symbol.
Severed Connection. Sequestered souls don't come about naturally—they are always the creation of a soul merchant. Sometimes, however, if their owner dies before they have completed their service, the sequestered soul might remain behind. These spirits look to pay off their debt under a new master, and most often go on to serve another soul merchant from the same family. If there are no other soul merchants, the sequestered soul looks for the wealthiest creature it can find. Since the soul is almost entirely unable to communicate, this can be an unnerving experience and the new master might mistake the soul for a malevolent ghost haunting it, rather than a helpful new servant.
Undead Nature. A sequestered soul doesn't require air, food, drink or sleep.