It has regeneration. This became apparent as I was blasting it and it was regrowing quickly, so I tried numerous energy types unsuccessfully to get its special weakness and ended up just doing enough nonlethal damage to knock it out and save my well-warded familiar. The DM and I were talking about it after I eventually summoned up acid spitting beetles to dissolve it permanently while it lay unconscious trying to heal up.
"Regeneration (Ex)
Bludgeoning weapons and acid deal normal damage to a tendriculos. A tendriculos that loses part of its body mass can regrow it in 1d6 minutes. Holding the severed portion against the mass enables it to reattach instantly. "
OK, acid working to dissolve tenacious plant materials I can see. Why bludgeoning? We could not come up with a satisfactory rationale.
Anybody able to think of one?
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