"What's with the jars?" Rathgar asked.
Allianora picked up one of the glass jars that glowed red. "I don't know."
Pushing his glasses back up his nose, Feris looked at the jar. "I'm sure this will come as a shock, but it reads as magic. Actually, they all do.
The room was covered floor to ceiling in shelves, most of them covered by broken jars. About a dozen jars remained unbroken, and all glowed faintly red.
"You shouldn't have come here" croaked a voice from the doorway, followed by the sound of shattering glass. Glowing blood poured from the broken jar on the shelf, and a figure rose out of it.
Nimble looked from the creature to Allianora "Don't drop that jar!"
Armor Class: 3
Hit Dice: 5**
Move: 150’ (50’)
Attacks: 2 claw
No. Appearing: 1d4 (1d4)
Save As: F5
XP Value: 300
Blood wraiths are creatures made from the blood of murder victims. They appear as invisible men or women covered in dripping blood. When created they are contained in glowing glass jars. When shattered, the Blood Wraith will attack anyone in sight. Blood Wraiths regain 1hp for every successful hit.
Blood Wraiths are created undead creatures, immune to sleep, charm, and hold spells, and can only be harmed by silver or magical weapons.
Image from Meanwhile, back in the dungeon.