For those who don't know, who are these bosses?
They are bosses of the vortexes of Edron (Dreadful Disruptor) and Kazordoon (Burster).
How to access?
Edron and Kazordoon's vortexes open and close periodically, both lasting 2 hours. Being inside a vortex at a moment close to closing (10 minutes) a message with this information is received, and completing this period, you are "kicked" out of this place, so it is not possible to stay indefinitely within these environments. To check if they are open it is recommended to use an item called Spying eye (photo below).
Kazordoon vortex location (below)
Edron vortex location (below)
How is the form of Spawn?
Spawn triggered, the boss can spawn in place of a creature.
[Data collected so far]
Kazordoon
According to some appearances, the boss appears to be a provoked respawn (by killing a breach brood), its place already tested is on the south "island" within the vortex.
Edron
Apparently, the boss spawns only in the southeast region of the area.
In this region there is the spawn of 8 Stabilizing Reality Reaver, and 6 Stabilizing Dread Intruder. (Not yet counted with the presence of the boss).
As the boss has the appearance of a Reality Reaver, it is assumed that it can spawn in one of the 8 possible locations, and through video it is suspected that it may be one of the 2 spawn locations to the west (marked in the photo below).
[Alert! - Information needs further testing]
Video of a meeting with the boss:
Possible Loots
Both bosses are believed to have valuable loots, the hypothesis supported by TibiaLight is as follows:
Dreadful Disruptor (Edron)
Menacing Egg.
Burster (Kazordoon)
Crackling Egg.
Why?
The theory established by this site is that the 3 eggs (Red, Green and Blue) follow an order of importance, with Red (menacing) being the least important, and Blue (Vibrant) the most important, following the RGB order .
The Vibrant egg can be obtained during the Heart of Destruction Quest, as a reward for defeating the World Devourer, in addition it can be obtained only once per character.
The Crackling egg originally could have been just a drop from Burster (Kazordoon) and the Menacing egg drop from Dreadful Disruptor (Edron), but due to a certain lack of interest from the players in their search, the drop passed months after also to the World Devourer (which would justify the fact that only after a long time the first drops appeared).