--- Note: This mob is affected by 'A Glowing Warm Shard' - Chance to drop in Miragul's Heroic Everfrost Instances ---
Glaciactus will spawn in near the Ice Door when the first two encounters are cleared. You will want to fight him in one of the two left hallways. Your tank will want to pull Glaciactus to just the entrance of either of the hallways off the main room. He will leash if you pull him to far down one of them.
Someone in your raid will want to have a 'Tinkered Spirit Trap' on them and activate it in the center of this large room. This will prevent the ghost adds during this encounter.
However, there will be non-aggro mobs roaming in the middle of the room when you pull Glaciactus. You will want your raid positioned near the door to either of the previous two encounter rooms to prevent accidental blue aoe aggro pulls.
About 30 seconds into the fight Glaciactus will spawn ice on the floor. In either hallway there are spots where there is no ice. Stand on those spots. There is a bigger spot of no ice on the side where Haladan's room is.
Joust the AOE's and just dont slow DPS. This is a straight turn and burn fight if you use the 'Spirit Trap'. Glaciactus doesnt hit hard at all. Titanic Stomp is by far the AOE that hits the hardest when you are in range of it.