LOM/OOM - LOM means Low on Mana, this is not a very common phrase. OOM means Out of Mana, this is a lot more widely used in game. Energy has a fast regeneration and has a limit of 110 (with talents) 100 without. Rage and Runic power are also from a 0 - 100 scale, performing abilities and dealing damage grants more allowing more abilities to be used. Mana has no capped amount, the more Intellect your character has the more mana you have to play with.