Like what Wyvern said...All "Arcane Lore" gives you is the ability to train the skill "Artifacts", which for some odd reason you can't automatically get until you train 1 level in it at a guild, then you can start adding points to it. There's several traits like this: "Cloak of Night" lets you train the skill Stealth, "Occultism" allows you to train "Enchant" skill, "Cabalism" lets you train "Blessing" skill, "Blacksmith" allows you to train in "Forge", etc.
-Saz
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