The latest balance update introduced the following change:

Lingering Curse: The condition damage gained from this trait has been increased from 150 to 200. This trait also changes Feast of Corruption into a new, area-affecting version called Devouring Darkness.

This new scepter skill, granted by equipping the Lingering Curse trait, is extremely strong in WvW:

Boons Converted to Conditions: 3

10 second recharge time

5 Targets

Ranged (900) AoE around the target (360)

This skill (thus) suffers from the following problems:

This radius around the target is larger than that of enhanced shade radius (300; Sand Savant)

The attack occurs around the target regardless of the target's state (Blocking, Invulnerable, Evading); The attack will still hit the players around the target and thus convert their boons unless they are mitigating the attack themselves.

The low recharge time combined with the amount of boons converted to conditions results in a skill with an extreme amount of boon conversion power (corrupts/strips), if not effectively the highest in-game

There is no clear animation/tell for this ranged skill

Taking all of this into consideration; This weapon skill is currently arguably stronger than any of the utility & profession (shade) skills.

My personal recommendation to bring this skill into line with other abilities is to at least increase the recharge time to 20 seconds & to reduce the amount of boons converted to conditions to 1.

Also The (AoE) attack should not occur if the actual target is not hit.