As we delve deeper into the Bastion of Twilight, each boss is more powerful than the last. While Halfus Wymbreaker and the dragon twins aren't the easiest raid bosses by far, the Ascendant Council and Cho'gall are on another level of difficulty. They're not only more complicated, but simply more punishing as well. You're going to use your full spectrum of abilities on these fights.
The Ascendant Council encounter emphasizes the importance of good positioning and healing on the move, while Cho'gall will stress both your AoE and single-target healing throughout the fight. Holy paladins have several abilities that are uniquely suited to each encounter, and knowing how to use those spells will be crucial to healing effectively.