Just thought I'd show off my Nightmare Zone I've built for my server being released soon; works exactly like the one in OSRS, rewards are slightly different just to fit my server but in essence it's all the same. None of the maps or objects exist in my cache so it's all from scratch.
Working Absorption Potions
Some images to coincide with the information.
The image shown is Endurance mode which is why there's only one boss (Elvarg) spawned, Rumble mode fully works with easy mode having two monsters spawn, intermediate three spawns and expert four spawns. The points system works depending on level but for endurance mode for example it's NPC's hitpoints x 7.5 so you end up with decent points.
And that's pretty much it!