Why are you running
Book of Mazarbul in expanded? It doesn't do anything. You want be drawing any cards with it any way as it has been stated that when a card says site 3,4,5 whatever it means fellowship block site unless it says 'any' site 3,4,5 etc... I might be missing something that uses tales perhaps. Maybe you are using it for
Proud and able damage/resistance boost on gimli, but maybe there are for more useful possessions to use. You could always run
Gimli's Helm since it could at least do something productive
, and it would effect anything as it isn't an armor or weapon so he can still bear 1 of each of those. Not to mention
Gimli's Helm is free where the book costs to better to give as little twilight as possible especial when paying 2 for a useless possession.