TheRealSpecialK on Equipment help 20 minutes ago. I will add a bit to the comment above. The concepts of Priority and the stack are really complicated - even for experienced Magic players. Thinking about this scenario in context of priority and the stack is really helpful. I will walk you through the scenario you gave with that in mind. Since League is an ever-evolving game, it is possible that milestones for specific Eternals may be adjusted based on changes to a champion or the overall meta. But if we ever do re-tune the number of milestones your stat represents, you'll retain the stats you've earned on that Eternal.
I am dedicated skill and achievement hunter in my spare time; reaching numerous goals such as black belt in taekwondo, deeply exploring skills in piano and ballet in my childhood, and grinding for video game titles such as S7 diamond league in League of Legends, and one time legend in Hearthstone GvG.
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