The Boss Cooldowns widget displays the cooldown of bosses you have killed at least once and that are classified as 
Archfoe (i.e. those with cooldown between 20 and 48h) in the Bosstiary, as well as the following special 
Nemesis bosses: Ferumbras Mortal Shell, Goshnar's Megalomania, The Last Lore Keeper and World Devourer.
Boss Cooldowns
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