Rogue and Kuro

Rogue wasn't sure on the riddle herself and neither was Kuro. They each had their own ideas, they wanted to hear Raiden's opinion on the matter, and since the rubble was staring to be cleared out, it was a good chance to ask him. Rogue looked at the room, it was being done pretty fast, but it would still take a little while with so much rubble. She looked at Raiden and spoke to him through the telepathic link, telling him the riddle, and asking him if he knew anything about it. Kuro on the other hand continued to think about it, as he did, he kept watch on the room, as well as listening to everything around him.

Morrigan 

Morrigan could tell that somebody was digging below her, it wouldn't take long for the room to be cleared, she smiled happily and laughed a little, she quickly flew back up from the hole she created back to the arena and waited, she knew that the room would soon be finished, and when it was, she would swipe the crystal for herself and destroy Berk. She would not let somebody else take the glory!