I do feel SS is a little to good for what it gives. Eaither that, or the other snowball items are to bad. It's simply the best item in the game for getting ap.
Sword of the occult just feels to weak to be worth it and falls short of other dps items.
Levithan is best used on heroes that need survivability, but in order to get charges and better survivability you need to survive (silly concept).
Mejai's on the other hand is the best item in the game, After Zhonya's, for getting pure ap and buffing your spells.
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