Kassadin/Strategy

Skill usage

 * Since his passive increases his attack speed when taking magic damage, getting immense amounts of health and/or magic resistance allows to absorb more magic damage which allows him to gain more mana from.
 * Use at early levels to harass the opponent. Because of the silence that comes with the ability, enemies will have a hard time counter-attacking in time.
 * You can again before the silence from  wears off if you have enough cooldown reduction, allowing you to completely avoid all damage against lone casters.
 * synergizes well with attack speed items and allows him to cast more spells from the mana gained.
 * While out of combat use to charge up your  and his passive to regain mana.
 * can endlessly cast if he can afford the increasing mana cost. Getting the  increases mana regen greatly. The magic resistance is also a nice plus, considering his passive and his anti-squishy role.
 * A risky way to deal a lot of burst damage to enemies is to constantly cast at the summoner pool. This will stack the damage on  while the summoner pool regenerates your mana. Using this method with summoner spell  can inflict devastating damage.
 * is fairly easy to kill if he can't away. When engaging the enemy, consider whether it'd be better to  in, cast your spells, and walk out, or to walk in, cast your spells, and  out.
 * You shouldn't in unless you are certain you can either kill your opponent or that they won't retaliate much. Casters will usually not be able to react quickly enough before the  lands, but AD dps are largely unaffected by your silence.
 * into a team fight will probably draw attention to you, something you want to avoid. As such, walking into a team fight and teleporting out can help you avoid retaliation.
 * together with will let you escape even the deadliest ganks.
 * Unless it is urgent, when traveling with wait until your last  counter has expired before using it again as  can deplete your mana very quickly.
 * is great for laning with or against champions with spammable spells such as and  as it ensures that  is always charged.
 * abilities have high ability power ratios and low cooldowns, so a high amount of AP  enables him to deal immense damage in short time intervals.
 * The, , and combo is especially powerful against casters, as it silences and heavily damages them before they can react to it. Make sure you have at least 4 charges in  before doing this combo, as  and  will let you gain the remaining 2 charges needed to cast it.

Recommended Builds

 * With his and his  active, it is possible to build  as DPS, though due to the rarity of the build and lack of proper testing, the effectiveness of this build is questionable.
 * can be build either as a DPS with attack speed and attack damage, a mage with ability power and mana, or an anti-mage with cooldown reduction and magic resistance.