u/Foreign-Hornet8772

So I’m a new player and diving into mythic content and got a +4 key for seat of the triumvirate. I started a group and asked for tips and advice and even looked it up on wowhead before listing. However there was about 2 groups of mobs near some stairs that kept absolutely killing me as soon as I got close(I’m a frost mage), and the tank was able to eat everything but I and most of the others of the group kept dying from em. I used counterspell as much as I could. I couldn’t find anything on how to avoid this and I’m wondering if yall have advice or helpful info for me to avoid this rough experience again.