Since its release in 2009, dozens of League items and monsters have been removed, implemented, or renamed. One of the best ways to tell new players from veterans is to look at the terminology they use to refer to some of them.
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In a thread posted to the official League subreddit earlier today, players debated which bits of once-iconic League terminology would be completely incomprehensible to newer players unfamiliar with the game's history.
The most agreed upon answer in the thread was the use of the word “Tabis” for Plated Steelcaps. Before Plated Steelcaps were the go-to boot for armor needs, the item was known as “Ninja Tabi”, which prompted players to recommend buying “Tabis” whenever an AD threat on the other team was getting out of hand.
Some long-time League players still use terminology from the old, pre-updated version of Summoner’s Rift, which got a fresh facelift in 2014. Players who refer to some of the jungle monsters by their old names can easily be identified as veterans. If you see a player calling Krugs “Golems” or Raptors “Wraiths,” you know they’ve been around for a while.