I have had no issues on paths 1 or 2, on many of the different classes i have been levelling, Path 3 i have had issues on, but that was mostly due to a lack of communication with the group.
I was on my thief (level 55 or so) at the time. and out group kept up with the burrows for awhile and began to get overrun, after this happened twice i changed my utlities over Withdraw, roll for Intiative, and shadow step. Once we got to the point where we were not able to keep up with the burrow spawns i simply kited the huge mobs of enemies around the room.
By this stage 3 out of 5 of us were dead leaving only two of us left kiting enemies from 60% to 100% complete.
I guess the point is, If you don’t have the raw damage in the group to burst the burrows down, then don’t try to do it, use a different approach and play the kite game, throw on evasions/dodges/survivability and lead the gravelings around until the timer is done.
The biggest issue i always have with path 3 is getting the whole group to co operate on a plan, or when we fail the first time no one is willing to change the weapons/skills they are using to something more effective.
Main point (for path 3) DPS isn’t the only way to do the burrows.
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