they should make halo an spender instead remove devouring and make that an spender.
era of dots is really gone to be honest.
an blink 2 (doors of shadows) instant cast 50% movment speed after cast dps during dispersion also instant cast halo and Void form and Dark ascension.
Then make halo an spender remove shadow crash make halo add dots to all targets it hits
also make fear an range aoe interrupt ability like warlocks stun