Where is the ICE STONE of SILITHUS?? (Midsommar)

In the event of Midsommar there is a quest called "Striking Back" wich comands you to slain a Glacial Liuetenant, a mosnter summoned by an Ice Stone SUPPOSEDLY in Silithus. But its not true. There are no Ice Stone there. Even the Quest Helper addons tracks you to the supposedly exact place where it should be. But htere is nothing thereor in the surroundings.
There are also some ghides on youtube traking you to the Hellfire Peninsula to kill a Glacial Templar, wich has nothing to do with this quest; you have to slain a Glacial LIUETENANT.

I've also seeing some guides that tells you that you have to talk with the NPC Zidormi in the Blasted Lands first, but that NPC doesnt even exists in WOLTK.

This is very confusing and frustrating.

Could somebody help me with this?
Thank you very much.