A swarm of Orcs?

[Aeolius]

One character in my undersea campaign is a swarm, of sorts. I decided that, when a covey of hags is simultaneously slain in the presence of their hag eye talisman, the item absorbs some of the covey's powers and takes on a sentience of its own. It then transforms into the likeness of the nearest animal or vermin of Fine size and begins to attract the creatures which it resembles. To date, I have devised the sea haggle and sky haggle.

The sea haggle is a Fine Damselfish Hivemind (Swarm, Aquatic), utilizing bits from BoVD and the v3.5 MM. Thus, as it adds members to its mass, it advances as a sorcerer.

 

[Piratecat]

Actually, the swarm rules would be perfect for tiny monsters like the 1e jermalaine. You could also use it to simulate the horrible swarming of gibberlings.

 

[BiggusGeekus@Work]

I think its a wonderful idea for abstracting mass combat. The DM needs a large encounter, he produces a "swarm" of orcs along with a boss orc.

 

[esorek]

The Monster's Hndbook by FFG has a swarm template that does exactly what you want and would probably be easier to implement then using the swarm type from the MM/FF.