It's in our PB vs WB 3v3 game on the Midguard map.
This turn I opened a L3 ruin (the one next to the razed city between the 2 continents on the left side of the map) and the reward was 3 Medusa's. But my stack is full and apparently the game can't find the one open square (a port) around the ruin to place the Medusa's on so I got nothing
If it's a pain to place 3 Medusa's on the map then I'm more than happy with an average L3 gold reward being given to me.
KGB