Talk:Youmuu's Ghostblade/@comment-5877442-20131213213304/@comment-5878487-20140120202650

based on the amount of armor penetration available from runes compared to other stats you could get instead (9 tier 3 primary runes are worth about 500g for every stat with a specific value), 20 armor penetration is worth about 790g, which is more than enough to make it gold efficient even without the active. also, a 45 second cooldown isn't very long, so you can use it for almost every fight. it's most effective when combined with a percent armor reduction, like darius e, yasuo ult, or last whisper because the lower your target's effective armor is, the more benefit you get from the penetration-up to a 20% increase in damage if the 20 armor it ignores is all that your enemy had left.