This guide is gonna help you kill yourself as the Shivan Assassin in the Shartuul event. Now, I know you're wondering two things.
1. Why do you need a guide? Just let the monsters kill you.
2. Why the HELL would you waste a darkrune like this?
Well, under normal circumstances you would never do this. This guide is for when the event bugs and the eye doesn't spawn. There are no mobs, and you're just stuck in the event. The following will tell you how to kill yourself so you can get out of the event.
Go to the very, very edge of the event (just before it pulls you back in towards the transporter). You have to be pretty close to it, and it might take you a few tries. Just nudge your way towards the boundary slowly.
When you get there, face the transporter and use the frost nova ability. This will throw you too far away for the transporter to pull you back and it'll shoot the demon with a fireball, instant killing it.
I'll make of video of this the next time the event bugs on me :P
Note : Leave a ticket asking for a refund of your darkrune. I've never been turned down.