Time Keeper's Necklace:

Once per session, the wielder of the Time Keeper's Necklace may choose to reroll a failed check; gaining moderately increased chances of success on the reroll, if desired. When this is done, the original roll is stored, and randomly assigned to a mech-rp of the next session. The Time Keeper's Necklace may not be used again until the original roll is "released". All non-magical attempts to determine the new placement of the original roll will fail.