Looks like you have to get all fragments for the ToM. I never did the challenges and I really need the fragments (Grimoire and quest...)!
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Edited by dnrobs: 10/2/2016 10:10:56 AMYou don't need them all,it takes 45 to get Tom,,I'm sure there where about 48 fragments. I know I got Tom before doing the worm. Infact I think we got it before hard came out.