Interesting concept but needs more work. Currently you're placing a lot of pressure on the two runners to do their jobs, if either one of them fails that's a team wipe as opposed to the four in the center who can rez eachother. The mechanics also aren't very deep to be honest, they're all just about shooting stuff. Sure you have the burglar buff but it's not very much to keep in mind. Some ideas I had: Have 4 towers, one in each corner. Each tower is a jumping puzzle rather than a guantlet of enemies. Have a buff in the middle that a player can pick up to enable them to enter one of the towers. As soon as this is picked up the encounter begins and the team gets the Unwelcome debuff. The buffed guy has to ascend the tower and flip the lever, which resets the timer for Unwelcome. The rest of the team defends some central plate from the scorn, including the wardens of the gate. If the wardens of the gate reach the plate they kill the guy in the tower and you have to start over, either having a very quick second run or a wipe. The wardens have shields that can only be dispelled by the burglar buff, which is assigned randomly to players in the center. Like the skolas devouring essence it will kill you if held onto for too long. When the runner pulls the lever they can jump down from the tower and the encounter goes back to the beginning. For hard mode you could make it so each tower requires a different runner.