https://wowwiki.fandom.com/wiki/Snak...?oldid=2492844
The snakes have 3 rogue-style poisons:

Crippling Poison: Enemy movement speed is reduced by 50%.
Mind-Numbing Poison: Enemy spell-casting speed is decreased by 30%.
Deadly Poison: Enemy gets 15 nature damage over 12 seconds. Stacks up to 5 times.