Fourteen

"Righ, before I forget," Tom turned his face away from the slime and towards his friend. "Did you manage to break through?" 

Back when Tom was helping Cleo with that matter, they weren't really in the position of checking her skills one by one. Thankfully, Marvin was capable of assimilating the energy of the stones without any excessive show. 

The reason why Tom asked this simple question was pretty straightforward. While there was some degree of randomness to one's skills, he still believed that one's need would influence what kind of skill they would receive next. 

"I think so," Marvin replied, looking down at his hands. "But I wasn't very far from it earlier, so it's not like that slime changed much," he added, trying to be as precise with the situation as possible. 

The slime on Tom's shoulder turned slightly red, clearly not happy with the remark.