Melee dps should not stand near the tank to avoid Raging Smash. At 50%, Ptah falls apart, and about 6 non-elite Jeweled Scarab and 2 elite Dustbone Horror appear. Everyone should stack on the tank and AOE them down. The tank should focus on the Dustbone Horrors. Everyone should watch for Quicksand, and run out if it appears under them. After all the adds are killed or after a set time, Ptah reappears. This is perhaps the most simple boss in the instance and should be easily defeated barring incidents like disconnects or the like.