Boss 1 - No. Post healing is sufficient if players have at least 80% of their HP.
Boss 2 - Post healing is sufficient if players have at least 80% of their HP.
Boss 3 - Yes. Protect and Shell for Tanks only; all other members receive Shell only. All raidwides inflict a bleed and Shell II is used as a mitigation.
Boss 4 - Yes. Similar to B3.
Use them at Pre-pull for Boss 3 and 4. Please bring them along and assist other members in casting them. This will speed up the downtime before each pull. Let's not leave this duty to the moderators, okay? After using Pro-Shell, go ahead and swap that duty action with a fresh Lost Action.
Having Lost Arise as a primary action in B3 and beyond is essential, so before renewing a fresh Lost Arise, they can use Pro-Shell.
By this point, most DPS will need to renew their primary actions' charges. Before applying a new Lost Action, a DPS should consider using Pro-Shell
Tanks, Melees and Range have the most capacity available for Protect and Shell. Please avoid relying on the Healers to bring them, they should be filling their holster with Lost Arise. Imagine only 1 person bringing Protect/Shell and having to cast Shell on 48 players and Protect on 10 tanks.