This is the complete list of Librams and the enchant they give you. The enchant can go on a head or leg slot item.
Libram of Constitution: +100 Hit points
Libram of Focus: +8 to Healing and damage spells
Libram of Protection: 1% Dodge
Libram of Rapidity: 1% Haste
Libram of Resilience: +20 Fire Resistance (Molten Core)
Libram of Rumination: +150 Mana
Libram of Tenacity: +125 Armor
Libram of Voracity: +8 to any attribute
Regards
Babysugar