Rector Droz'Kzar

Rector Droz'Kzar - 101
 * Buff: "The Kly's Benediction". Immune to damage and is rooted while near the altar.
 * Casts Septic Blast periodically: Inflicts 591063- 633938 disease damage on targets in Area of Effect instantly and every 2 seconds.

Once aggro'd, Kly believers around the pews will become aggro.
 * Buff: "The Rector's Proclamation" Very important line in the description: "Killing too many too quickly may prove deadly".

Kill these believers slowly, one at a time. Once you have killed 3 or 4 of them, Rector Droz'Kzar will become angry and leave his altar to attack you for a short time before dropping a totem on the ground. Get away from the totem quickly. It has a knockback on it that is capable of hitting for 2-3 mil before it disappears. A good range seems to be 20m (a closer range hasn't yet been verified).

Rinse and repeat, kill 3 or 4 believers; damage the Rector when he leaves his altar; dodge the totem until he's dead.