The boss Brown Bear could be considered a Berserker, but his unique spiked club definitely wouldn't drop. In Glory, boss drops wouldn't be universal. Nearly all boss drops matched the boss's class. For example, a physical type boss like Brown Bear wouldn't drop mage-related equipment.
Although Demeter wasn't obtaining these items from the boss's corpse, from the First Kill rewards of the previous three bosses, the rewards all complied with the boss drop rules.
After clicking on the button to receive the rewards, a message immediately popped up in their team chat.
Sealed Mountain Heavy Armor
This was the Brown Bear's First Kill reward, a Level 75 Orange heavy armor. +37 Strength, +28 Vitality, -20 Spirit, Physical Defense +10%, Strength +4%, Vitality +4%, Spirit -10%....