Recently, some late night hotfixes were pushed to live servers which nerfs the final boss of Neltharus, Warlord Sargha.
Warlord Sargha NerfsThese changes improve the quality of life of the intermission phase and reduce the penalty when a Curse dispel is not present.
Curse of the Dragon Hoard damage nerfed by 20%. Curse of the Dragon Hoard max stacks capped at 1. All treasures can now be cast while moving. The Dragon's Eruption (swirlie) projectile speed reduced by 18%. Read more on wowhead.com