Lifesteal and Spellvamp are problematic stats in LoL. They are complicated unnecessarily, hard to understand, and very restrictive.

The majority of Summoners are confused about how these stats work exactly, even Pros are unsure about the specifics. And for Riot Champion Designers, they struggle to maintain the balance between all the different spells on all 116 Champions. Some Champions can abuse Lifesteal and/or Spellvamp, and others find it abo****ely useless. Some Champions are nerfed into uselessness because of their ability to heal with these...
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