Vegeroth cannot be pulled or agroed until his surrounding trash is dead. He will still attempt to cast https://everquest.allakhazam.com/db/spell.html?spell=10990 while 'inactive'.
Vegeroth has 900K health, hits between 800 and 6K, is easily slowable, and partially slowable. He will cast his AoE in a frontal direction, and it is easily resisted.