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Heimerdinger Build Guide by Eyerascible
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As for my general style, I am currently working on developing an offtank-DPS heimer that is mostly a HP tank rather than one with a little less HP and more mitigation. From my few games in the beta I saw most competent people picking carries or tanks, and going for straight up DPS or mostly tank items.
The general idea for me is to camp a point which is likely to get pushed and set up two turrets as far apart as possible, while making sure that a melee champion attacking one is within the other's field of fire. I then poke as hard as possible, even letting myself take some damage, with the sole intention of getting an enemy to chase me into range of both of my turrets. Once I can being chased and close to my turrets, I save stun grenade to use it point blank when the enemy champion is right between my two turrets.