My friend got this crazy build on POC with Kayn, 2 Kayns strike this is a level up, and since they recall, he can play 2 Kayns. That's not all, he plays
Kayn Build Guides :: League of Legends Strategy Builds, Runes and Items
In Depth Guide To Kayn Builds, Runes & Counters - SenpAI.GG
Kayn Build Guides :: League of Legends Strategy Builds, Runes and Items
Kayn Build with Highest Winrate - LoL Runes, Items, and Skill Order
Kayn Build - Highest Win Rate Builds, Runes, and Items