Found a bug/exploit in the game. For quests where the mission is not to defeat the boss but to accomplish a task, for example, Baron Fuego "destroy the crystal." You can select auto navigation from clicking the quest menu on the right, and then open Rune Temple while ur hero is running towards the Baron, it will skip the battle, and give you credit for completing the quest without having to fight the boss. This bug happens on a few other bosses i have seen also, this is the one i happen to remember because it just happened to me by accident. Thank you.

DS
Forest Realm
Blaze of Fire Dragon