LB confusion

[Kirika-]

It's mostly dependent on the situation.

• Healers should only use LB in the event of protecting from an emanate wipe, as it AOE rez's and/or AOE heals depending on the LB level, it does no damage to monsters
• Tanks use it for group wide damage mitigation, blocks a percentage of incoming damage for a time, doesn't hurt the monsters
• Melee DPS LB is for a single target, so use it only on Boss monsters
• Range DPS LS is for all targets within a straight line, so use it only on Boss monsters or on a tightly packed group
• Ranged Magic DPS LB is a ground marker AOE, place it in a spot and all targets within the marker are hit by the LB, use on Boss monsters or more spread out packs of monsters

More details per job here:
https://ffxiv.consolegameswiki.com/wiki/Limit_Break