Shatterd Portal

Basic Info
This unknown entity appeared in part twenty eight is clearly not apart of GW2.

It can be seen fading in when Greekmuller closes a menu and the shadows don't match the surroundings.

It's assumed to be a portal given season threes main theme of stargate (which is a portal).

It doesn't last long and disappears shortly after the menu is closed.

Part 29 confirmed that it was a portal with Greekmuller travelling through it, in the same episode, a field is shown to contain multiple portals, indicating that the portals aren't limited to just one per area.

Appearance
Its appears to be a glowing core of energy with what appears to be shattered glass revolving around it.

In Part 28, we see the portal opening up, shown it coming out of nowhere. its was similar to an explosion, with the 'glass' coming out and then revolving around the central glowing mass.

In Part 29, the portals seem to be different shapes and sizes, indicating that they don't have a default appearance however the energy cores seems to be brighter that those of seen in tyria, this could mean that this plain is the one the portals originate from.