"You can't milk those!"
Alistar
The rock-solid ability you wouldn't want to meet an immovable object
Unstoppable Force (Malphite R)
Big Purple Worm, and an item that gives attack speed and magic damage on AA
Baron Nashor's Tooth
Dragon's Hoard
Smolder and Aurelion Sol
Controlling one of these for your team granted 10% movement speed. Two restored 1% max health on minion or monster kill
Altar
"The cycle of Life and Death continues: we will live, they will die."
Nasus
This champion can use allied poisons to their advantage
Cassiopeia
League's 5v5 map, and the charging neutral monster that spawns on it
Summoner's Rift Herald
Catch Me If You Can!
Jinx and Vi/Caitlyn
Twisted treeline was removed in this year - players were gifted an icon and emote based on the number of games played on the map
2019
"Know that if the tables were turned, I would show you no mercy!"
Veigar
This item gives 3 seconds of bonus lethality after being out of combat for 8 seconds. Don't miss your window!
Opportunity
The Acid Spitter, and an AD Magic Shield item
Kog'maw of Malmortius
Bad Blood
Renekton and Nasus
This neutral monster on Twisted Treeline granted a buff that granted Ghosting (no unit collision) and Horrify (minion fear)
Vilemaw
"Did I leave my Tridyminiumobulator on?"
Heimerdinger
This Nidalee skin is easy to "spot" with it's iconic animal print
Leopard Nidalee
Yasuo W, Karthus W
Wind Wall of Pain
Golden Ratio
Jhin and Hwei
This Treeline-exclusive item granted Ability Power, Magic Resist, Armor, and Tenacity to its user. No item since has provided these stats
Moonflair Spellblade
"Impossible comebacks are sorta my specialty."
Ezreal
This eggcellent champion's title, from the Greek meaning "Frost Griffin"
Cryophoenix (Anivia)
Oversized AP component item, completed item that grants you a level when it fully charges after 10 minutes
Needlessly Large Rod of Ages
Fishing in the Lavender Sea
Bel'veth and Jax
Since wards weren't allowed, this trinket item created a small puff of smoke which granted vision for a short time. It's since been reintroduced in Arena
Arcane Sweeper