Only one and honestly can say it made the raid way more enjoyable since I didn't have to juggle an ad clear weapon with a champion stunning weapon and a strong enough weapon to kill said champion especially since the ogre only spawns like twice throughout the first encounter and can be stunned before it can even attack.

Lucent Hive would have been cool.

Only one, at the first encounter. Unstoppable Ogre. Pretty easy to deal with really.