Beyond demon
![](/images/thumb/2/2a/Beyond_portal.png/300px-Beyond_portal.png)
Beyond Demons are interdimensional unique monsters introduced in Forsaken Masters for the Beyond league. When you kill monsters in close proximity to one another, small portals start to open; get enough of those open together, and a larger portal opens up, spawning more powerful monsters. If those happen close together, an even larger portal opens up, complete with a unique boss that's extremely difficult to kill.