So as some of you may have experienced Nazgrim is one of those bosses that make you love being inside a LFR group.
I think it is worth posting and discussing it here (as a method to spread info) because typing and arguing in-game with randoms is simply not going to happen.
After some thinking myself, that is the best strat I could think of:
2 Phases strat -> P1 (100-13%) and P2 (13-0%)
P! (100% - 13%)
Banner > Warshaman > Archmage > Ironblade > Assassin > Boss
If the tanks are well aware, they can handle banner alone (It has only 1m hp and tanks have constant high vengeance throughout the fight);
Tanks don't bother tanking adds at all, if anything they can random taunt non-warshamans into melee to get cleaved (No reason to not why, easy rDPS gain);
Tell people to burn warshaman in the opposite side where Nazgrim is being tanked (So totems and heals don't matter much)
Defensive stance: Simply ignore the fact it exists, as long as one player constantly fails it there is no reason to the other 24 players to stop DPS - the rage gain will be almost the same.
Cooling off has 15s duration, the rage gain from proccing the defensive stance inbetween Cooling offs -assuming perfectly 100% downtime on the ICD- is only 45 rage. As long as the banner is kept under control and tanks swap properly he won't cast ravager.
Reasoning being: It is almost impossible to make people not trigger that proc, warsong shouts don't even hurt in LFR and there is no reason to try to control the rage below 75 since heroic leap and banner hardly matter in LFR;
Lust on 2nd Berserker Stance if boss is around 30-40%, otherwise wait for 3rd (last before enrage) Berserker Stance.
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P2 (13-0%)
Same deal as P1, only change is that now non-Warshaman mobs should be ignored.
Very likely the 10% extra wave of adds will join the fight meanwhile others adds are still being fought and the timer to the next following wave is not delayed, which means another wave of adds is soon joining the fight. It is simply asking too much rDPS from LFR group to kill those 2-3 waves before people start dropping dead.
By the time the snowball effects start happening, boss is close to 10% - Only 60m hp to burn, each add have 12m+ hp, for comparision. Considering all the DPS swapping it is just not worth it to kill assassins and ironblades. Archmages are arguably ok to still be killed, but still not necessary.
The tank that has just swapped off the boss starts grabbing all adds and tanking them in the other side of the room, handling the archmages interrupt/CC as priority (Warshamans should be dead).
If a ravager spawns because the main tank has too many sundering armor and/or banners are not going down as fast as they should (because said tank was one of the main damage dealers on the banners) it should simply not matter, the boss is low enough to die in a few seconds.