Help with question about bosses
From the wiki.
“World bosses are special event bosses encountered throughout the open world of Tyria that spawns a ground chest (that can be looted once per character per account per day) and awards players with one “bouncy” bonus chest containing a piece of rare, or exotic, gear (limited to once per account per day) when defeated …. However, characters must be a minimum level of 40 to receive any rare rarity gear from the event."