Just a warning. It's quite possible that this could, in fact, be nerfed and/or changed. I would suggest saving at least one of these in a bank on a 101 in-case they remove the "bind on account". For anyone unaware, http://www.wowhead.com/item=153114/nathrezim-tome-of-manipulation is an item you send over to your 101s along with account-bound rep tokens towards paragon chests (large chance at legendary). Once you stockpile a sufficient amount of rep tokens, you use the tome to increase rep by 200%. This turns a 250 rep into 750, 750 into 2250, and 1500 into 4500, vastly increasing the rep gain from these various rep tokens for more chests. Recommended you open the chests after legendaries are upgraded to 1000 in an upcoming patch. On the occasion that you do store one of these in your bank, theres a chance that if nerfed (but still usable by 101s) you could save one far beyond anyone who didn't get the memo, resulting in a larger stockpile of rep tokens and paragon chests.