You approach a woman sitting on the floor. She has pale skin and appears pregnant, but gaunt, and partly rotted. It soon becomes clear from the stench that she is undead. When you alert her, she rushes toward you, scratching at you with her claws. Once she is dead, a smaller version of her tears her way out of her stomach in a wave of ichor. The horrifying sight forces you to make a saving throw or be shaken. This 4-foot-tall monster attacks until killed; it dies quicker, having half as many hit points. Once it is dead, yet another slightly-smaller monster unfolds from within the belly of this one, to attack further. This continues, the attackers growing smaller and smaller, the space seeming insufficient for how large they are, until a tiny hand reaches from the last one, too weak and pathetic to attack.

It's edgy but it really freaked out my group the first time I used it. Partly because they didn't know if the "nesting doll" effect was ever going to stop.

I had it be the result of when a zombie plague infected a pregnant woman. It had a weird effect. Unironically was going to use it in another campaign, it was even in the dungeon, then my friend who was in that game got his girlfriend pregnant so I removed it because I thought that'd be kinda fucked up.