In the mentor roulette I often get new players who know nothing about the limit break;
What it does
How to use it
How its shared
How its affected by role

Its clear that newbies are doing the Hall of Novice because they have the gear.

Please consider adding the use of Limit Break with a fail mechanic if not executed properly.

DPS
A simple dps check that would require it. Kill the target before they finish a cast that will cause a wipe.

Healer
Two consecutive high damage aoe's, requiring the cast in between.

Tank
A tank buster, requiring the buff to survive a specific attack.