Kluzen The Protector is a easy first step in Veeshan's Peak. A simple tank and spank with a small joust of the Wing Beat AOE is preferred. Pull Kluzen to a nearby wall because Wing Beat is a heck of a knockback so you want your tank and healers to be as close as possible without being knocked too far away. The archway behind Kluzen is a great place to tank him. Just joust out beyond max cast distance when the aoe is incoming. Roughly 35-50 meters away. MT group healers should be able to stay in and take the AOE just fine.
He does have another frontal Toxic attack with moderate damage, just cure and continue. Its very minimal damage.