Fitter saw the giant fist coming for him that sealed Space and Time itself. He knew he was finished and that his wicked plans had been seen through, so he panicked.
"LADY LUCK, SAVE ME!" Fitter roared in his desperation.
Answering his call for help the Infinite Dragon remaining with Draco suddenly rebelled, causing him to falter and spit out blood. Draco was shocked that such a thing could occur to him, and when he investigated, he saw that the Infinite Dragon was glaring at him.
When he questioned why it dared to do this, its answer was that Fitter Cleric was its chosen meal. Naturally, Draco was confused by what it meant by calling Fitter its meal, so it happily elaborated.
Fitter was a naturally blessed person and had strong ties to the Dao of Luck, and the Infinite Dragon grew by consuming such Chosen Ones becoming stronger.