User blog comment:Emptylord/Blogs/Reworked Runes (2015)/@comment-4022742-20150518073358/@comment-3974211-20150520020757

Why, though? 1 mana regeneration is not going to make or break anything. Especially since most players do not take such runes at the moment - so rewarding players who choose to invest should be a, well, reward (compared to 15% cooldown reduction or attack speed).