Need to learn your classes' trait lines and their purpose.
What do you do when all your debuffs, etc are up and running? You are refreshing them, healing/curing, giving power to those who need it!
In a raid, the only time a Yellow LM should be putting out damage is when it is burn time; and you still keep the debuffs up, and healing-curing, and giving power. In most cases, if you attract a mob, you did something wrong.
<snip: cut out the lecture on what a LM is>
NOTE: I just started raiding in LOTRO. The above advice is based upon a culmination of many years as a Hard-Core Raider (EQ, STO, SW:TOR, Aion). My main in LOTRO is a LM (solo, 11 years)
Ujest - 140 Lore-master, Opun Tia – 107 Warden, Tummi - 105 Captain, Veneur - 75 Hunter, Cneasai - 66 Minstrel, plus alts and mules
Officer, Pipeweed and Ale, Arkenstone (formerly – Friends of Frodo, Vilya)
and Star Citizen…