When you zone in, there's nothing but some non-agro trash mobs. You can ignore the rats, but it's safer to kill the spiders so they don't get in your way later and you can get some AA for killing one.
Near the entrance, there are six graves. If you hover the mouse over them you get the name of the hero buried there. If you right click on them, you're given an option to either whisper a prayer, or defile the grave. Either way, you must interact with all of them.
Shortly after you've interacted with all six graves Ronicus the Red and his crew will spawn. Depending on whether you prayed or defiled the graves, Lord Tonmerk will spawn, either as an NPC or a 22^^^ paladin. Praying at all the graves causes him to spawn as an NPC, and if you talk to him he'll give you an Idol of the Eternal. If you defile any of the graves, he spawns as a mob instead and drops Idol of the Wretched.