I am camping the dude for the prod, and came across these scorpions.
First time, I had my 80 war attack the skelly and was surprised to see a bunch of scorpions. They were no trouble to kill and found this talisman among the dead.
The second time, the skelly was on a different table. I attacked with my bard singing a 78 per tick DoT. All of the scorpions, save one, died at the same time. The one remaining had 58% health. I did not get any resists to my song, so this one is special. When just this one was left, I pulled him away from the others (yes, I got summoned once, but he came afterwards) and killed him. This special one had the talisman. It was easier to loot because he was pulled away from his normal friends.
The respawn timer was between 20-40 min I think, but I wasn't paying a lot of attention.
The summon, rampage, and enrage. They are immune to runspeed changes as well.
One last tidbit, there were 20 regulars and the 1 special.