Skeleton King

Basic Strategy

 * Hellfire Blast is very good nuke, disable and slow at the same time. Perfect tool for ganks and team fights. It has a relatively low cooldown, so spam it if you have enough mana.
 * Vampiric Aura allows you to heal yourself simply by hitting enemies. Your melee allies also benefit from it. Scales nicely into the late game.
 * Learning Vampiric Aura during laning phase will shift the creeps equilibrium and you'll be forced to farm and fight under enemy tower. Good for pushing, but hurts your farm and puts you and your allies in disadvantageous position.
 * Critical Strike drastically increases Skeleton King's melee DPS. Synergizes well with Vampiric Aura, healing Skeleton King a big chunk of health every time he crits.
 * Reincarnation revives Skeleton King if he dies during the battle. Always make sure you have enough mana for this skill.
 * Hellfire Blast is usually maxed first and Reincarnation is taken as soon as possible. It's also recommended to take two levels of Stats on early levels to improve Skeleton King's mana pool and health.
 * Armlet and Soul Ring are commonly built for Leoric because Vampiric Aura allows him to heal up quickly after taking damage from these items.
 * Activate Phase Boots and Drum of Endurance at the same time and you'll have enough mobility to chase and kill.
 * Your battle strategy is very simple and straightforward - turn on Armlet, Phase Boots and any other items you may have, stun the weakest enemy with Hellfire Blast and keep hitting him till he dies. Repeat, if there are other enemy heroes nearby.