ToME: the Tales of Maj'Eyal

Totality's description says it reduces cooldowns of Celestial skills by 3-6. I understand this to include Moonlight Ray, Twilight, and Healing Light... yet, using these skills while Totality is active puts them on their normal cooldowns... 3, 6, and 10 turns, respectively, instead of the 0, 0, and 4 turns I was expecting after investing 5 skill points into Totality.

Try activating Totality while those abilities are on cooldown.

Not a bug. Totality reduces active cooldowns by X turns. The tooltip is misleading.