I've just only realized that there are tomes in the Paladin Order Hall that you can loot - when you use them, you will gain a buff.
Light in the Darkness: When used, shows the location of all nearby demons and undead on the minimap. (Kinda reminds me of the old 'Sense Undead' thing we used to have way back.)
Striding with the Sunwalkers: When used, increases your movement speed by 10%. Would've been nice to have seen that one while leveling...
Those are the two I found, anyone else found something other than those?
Both of them are in the section where the portal is. The Light in the Darkness is on the table in front of Champion Vranesh, Striding with the Sunwalkers is next to Sir Almande Graythorn (Class Hall Upgrades).