As the topic said: Great leveling spot from 40-50 (or more)
12k-25k XP / about 20-30 mins.
+Great loots (yellow rares)
3/5 for me, the final loot from the boss was 1 gold.
Location:
Start Event - first of many:
Location of the events after the start event. (Events will go on for 20 mins)
Example Event in that area: