The big encounter at 55 is Emp Ssra for the Luclin achievement. You can’t bind anywhere nearby so you need to beat it “legit”. I assume it would be done by charming the High Priest and basement undead mobs and kiting the Emp adds in the basement.
To tank Emp you need tanks to have at least 2900 hp (easy) for a defensive tank to survive his max damage attack round. Just need about 6 tanks and enough clerics to run a 1 second CH rot.
He has a huge nuke he uses like every 65 seconds but you just have all your knights treat that like a PoSky DT. Taunt, eat the nuke, get a rez.
As far as gear I am guessing GoD group named have better gear than Luclin raids minus some stuff in VT. Tanks will be tremendously fat from this and able to tank mobs pretty handily.