Talk:Heimerdinger/@comment-24228596-20140120204827/@comment-3308937-20140120205555

The idea is that the passive effect increases his turrets' damage. It also comes with a good amount of ability power and cooldown reduction and the passive and active effects strengthen his already high pushing power.

Overall though it isn't that useful. If you want AP and CDR Athene's gives 20 less AP and the same amount of CDR but also comes with mres, mana regen and an easier build path due to building out of chalice.