Right, so as of the last patch, the purple tarantulas and weavers seem to have gained a new poison ability.
The guts of the ability :
Prevents actions for 30 seconds.
Sets strength, dexterity, focus and power to 80% of normal totals.
Does 120 direct nature damage every 5 seconds for the duration.
Cannot be dispelled.
This is absolutely insane. The weavers and tarantulas are all highly social and it's quite a challenge to pull only 1 and kill that 1 without getting any additional aggro. You now have to face being disabled for 30 seconds of the fight without being able to heal yourself, which means you not only have to have 900+ health in reserve at all times, but you ALSO have to have enough extra health to deal with any extra attacks while you run around like a useless idiot trying to not draw any other nearby mobs into also attacking you.
Wtf? How is such an ability appropriate to put on every t5 spider mob, when the ONLY way to "sort-of" defend against it, is a top end spell which can only protect you 2 out of every 5 minutes? Nevermind the fact that if you aren't in a mystic class, you can't even use it period. And to add insult to injury, making the spell requires 5 purple weaver venom.