MightyZehir
Explorer
Hiya.
Poisonous Snake: +5th, 1 damage, DC10 Con save for 2d4 (or half).
I'm not sure where you got that 3d6 thing...? Anyway, with the +5 to hit, I'd figure about 5 or 6 would hit PC's of median AC (12 to 15), so grand total is between 10 and 54 damage (so, what, call it 32 average?). The snakes only have 2hp each, and we are talking 5th level guys here...so those snakes will likely be dead in one, maybe two rounds (area spell, general attacks, flasks of oil, etc). I don't think I'd worry about anything "overpowerful" in that spell...
^_^
Paul L. Ming
Not poisonous snake.. it's GIANT poisonous snake.