"Premitigation Damage" - Clarity Issues

Hi, I was just informed that Premitigation Damage, in reference to Athene's Unholy Grail, is a very high dollar word for "damage taken before factoring in armor and MR." However, I'm not familiar with the word, and neither was Google, so maybe there needs to be something to help clarify what it actually is. I had no idea how the Grail was actually charging itself, and I'm sure I can't be the only person who's confused by what "premitigation damage" is. I understand you number crunchers and finance folks know exactly how to explain it, but for everyday folks, it may as well be a word in another language that the context in the tooltip doesn't even help to explain. So Riot, throw us a bone and help simplify your wording so we know how the item works a little better.