Ok anyone that has done the Halloween event from last year would know Shadow fiends and their new invasion counter part does an aoe life leech and damage that's based like around of targets in range.
So more people/pets/summons in range the more damage it does and more life it leech. If the shadowlords are smart they would just spawn those nonstop since most people just keep doing the zerg and just 2 of them would keep the defending party busy for a good while.
Most of the time fiends die when it killed so fast that only the people that people need to run the res then the range attackers that are smart enough gets to kill it before the zerg mob res.
So more people/pets/summons in range the more damage it does and more life it leech. If the shadowlords are smart they would just spawn those nonstop since most people just keep doing the zerg and just 2 of them would keep the defending party busy for a good while.
Most of the time fiends die when it killed so fast that only the people that people need to run the res then the range attackers that are smart enough gets to kill it before the zerg mob res.