Blade vortex (v), which is a whirlwind of spinning blades. It has two engulf attacks that deal 2d4 physical damage each, and is difficulty 12. Apart from generating normally, it can be created by polypiling a sufficiently high number of blades at once similar to how golems are created. When killed, it drops an assortment of bladed weapons, mostly smaller ones like knives, daggers, and short swords, and possibly a chain or two. It can be harmed by thrown potions of water, rust traps, and rust attacks.

Another iteration of the proposal is to make its blades its inventory rather than just assumed to be part of the monster, with the following interesting implications:

• Rather than just the monster dealing damage, it actually makes attacks with randomly selected weapons against an engulfee, which could do things like silver damage if the vortex has silver weapons whirling around inside it.
• Could have 6 attacks, each of which must use a different weapon. (If it only has 3 weapons in its inventory, it only gets 3 attacks.)
• It would also have to generate with an inventory of a few blades, selected randomly from the set of bladed weapons under a certain weight (no giant battle-axes).
• If it passes over blades lying on the ground, those are sucked into its inventory (which would make it even more deadly if it attacks with weapons it holds).
• Also, hitting it with thrown blades will result in those blades being sucked in (and possibly dealing no damage since it’s obviously not harmed by its own blades).