Operation Harpoon: Defiled Portal

Gain access to the portals of Twilight Isle

We, Overlord's Scouts, managed to get to that cursed isle before there were too many demons around the coast. But I couldn't open the portal here! I did it a thousand times before, but the monster guarding the portal on the Isle is truly terrific! Apparently, it is filled with demonic foulness. I nearly jumped into the Astral with fear! Fortunately, we have found the way to restrain those fiends, and now the portal is at your service.

Hurry up, we have a little bit of time left!

I don't know how long I can keep the Portal open... The Guardian is in rage and is trying to close it. Perhaps I will need you help again later.
Now that the Portal is being kept open, allied troops of the Wormfaces and Draconids can start fighting the enemy. But we, as Overlord's vanguard, still have a lot to do...