Named will place increments on raid members, dependent on their distance from him. There are 2 colors: blue and red. They will both tick up to 10 increments, if you reach 10, you cause a wipe.
Standing Within 7m, will cause Blue increments to go down, and red to go up.
Standing Outside of 7m, will cause Red increments to go down, and Blue to go up.
Tanks will be effected by this, and in such creates a tank swap mechanic. If the first tank pulls named, the 2nd tank should stand and build up their blue increments as fast as they can, so they get longer time tanking named before swapping again. When tank on named has 6 or 7 red increments, swap to other tank, who then has 6 or 7 blues to tick down, and back upto 6 or 7 red.
Named will also place a curse on random raid members, which requires you to be within 8m of the mob. If you fail this, you get a knockback that usually ends up with several raid members off the edge.
Basically always be either at 7m or 8m from the named, never further. (Unless Add tank)
Spawns an add that must be killed at a distance from the named. Roughly 17m from Named. If killed too close or too far, named gets damage immunity for a period of time. (Not a major issue, just prolongs fight.)
Short Version: Blue far, Red close, Tank swap, add killed at right distance.