How do you get the Armored Titan Nasus Chroma Icon?
It came from an event shop. Riot's description in the client reads: “An icon that comes with the Event Shop-exclusive chroma”
Is the Armored Titan Nasus Chroma Icon still available?
No. The Armored Titan Nasus Chroma Icon came with an Event Shop chroma that cost event tokens in the 2022 event shop. Past event shops do not return, so you cannot earn this icon anymore.
