lol that ramp is a killer if you don’t know what you’re doing. The first 2 packs don’t spawn hostile so it’s possible to skip them. Of course, any pug group that tries to do that inevitably ends up pulling both and wiping anyway. Pugs gonna pug. So when I tank it I never skip. The trick is to interrupt the aoe spam the side casters do since 99% of the their damage comes from them and since it’s an aoe, it will wipe your entire group easily.
After those 2 packs are the undead packs. Unlike the first 2 packs, these spawn hostile. So it’s always funny to see idiots try to run passed them to the tunnel entrance only to get obliterated by 10 mobs at once 
. The trick to these 2 packs is to watch for the circle of ice cast. If you see a circle of small ice cubes spawn around you, you need to gtfo asap or you will be one shot. I’ve solo carried many groups passed these 2 packs since everyone else is usually insta killed. Sometimes I get lucky if a caster has hung back a bit.