Talk:Ahri/@comment-27150096-20151102045834/@comment-27214801-20151114140841

12/18/0 is better for casters because the flat mag pen is going to be better for damage in most cases since you will still have to build a Void Staff to kill tanks and that scales multiplicatively with the 7% mastery; deathfire touch is only useful on mages like Cass/Swain/Brand who can apply it multiple times with a single spellcast since it requires multiple applications to outdamage Thunderlord's Decree. Thunderlord's Decree also adds a lot of burst late game (180 damage at max level + some AP) which will help you assassinate people. Also the tooltip is wrong about it's AP scaling; it's lists 20% of your AP instead of 10% but I don't know if it's actually applying the extra 10%.