Magic The Gathering cards, pretty sure it’s some part of the lamination process. Under the house smell, earthy aroma that has stagnated for a few years. Moss covered valleys and crevices, basically where moss is so concentrated that it just jumps into the nose.
They don’t own Everquest or Planetside. That was Sony Online Entertainment (SOE for short and separate from Sony Playstation) and then it got sold to become Daybreak Game Company. And, Daybreak hasn’t been doing that great last I looked.