How do you get the Primordian Bel'Veth Border Icon?
It came in a bundle. Riot's description in the client reads: “An icon that entitles the border for this champion.”
Is the Primordian Bel'Veth Border Icon still available?
Probably not. Riot tied the Primordian Bel'Veth Border Icon to 2024 (bundle), and it does not normally bring back past event rewards or bundles.
