Hyper Regeneration

[domino]

Yeah, one big squishy domino-effect .

Har!

Seriously though, I seem to recall a special ability or two that involved blood spilling (bane, or something like that) that would not trigger from bludgeoning damage.

 

[Sledge]

The Book of Templates Deluxe Edition (now in 3.5) has a template called hypermitotic, which has the rapid spawning. It also goes into all the consequences of such a creature in a campaign.

 

[daBooj]

Perhaps you could allow it the spawn ability as first written up with one catch, the spawns created in this manner wither and die the next day.

Think of the limit on the number of heads a hydra can have. The hydra may have twice as many heads as normal, but the extra heads wither and die leaving the proper number of heads in the end.