Orb of Darkness infinity time was a bug the item said something about giving 12 minutes extra after you lose no infinity, I see lately bugs not exist anymore all of them are either feautures or tricks as it suits, only solution I see for your problem is to play older version with the bug, I don't think that any map creator would revert a bug fixed because the bug has fans.
Seems like nice INT item, perhaps you can give only basic info in game and full description in quest log or make "command" (-MegaHoly) to see full info on effect(s) and CD and everything ... If there is effect with same name in several item versions perhaps -MegaHolyX, where X is "lvl" of item. If you want hide from us some of effect's before we actually get next lvl of item give us command in basic description (when you lvl up item to "lvl 2" command is something like MegaHolyB02 or MHB02). Or -MegaHoly7 give you full info for current version of item if it is on inventory number 7 (NumPad 7).