Megrlof is a half-submerged giant built ruin. It rests in the waters of Allof Stond, yet this was not always so. Before the Allof Stond War, it was a lake of molten lava and Megrlof was a seemingly impregnable bastion with fire giants patrolling its great walls.
In the First Epoch, fire giants built Megrlof as a base to help guard and spread the lava of Ofli Hrolmir, and indirectly the expansion of Surturs Artery. They did this in such a way as not to be too upsetting to the locals. For a time they had good trade relations with the Underdark city-state Hlothrabatta and the surface empire Melephaeusa.
Megrlof was abandoned at the end of the Allof Stond War. As terms of the surrender, the city was abandoned; this was not a bitter pill to swallow since the fire giants were none to happy with the cooling of the area from the lava lake Allof Stond being cut-off from its source of lava. On leaving the city, the people headed south to Trelshum and Thrammaer where they split up as refugees among the various holds of those areas.