Shockwave needs the enemy grouped and still; Solar Flare does both. Leaving the ball on Leona turns her walk-in into a delayed area stun.
Setup
3/3
Protection
3/3
Control chain
3/3
Synergy notes combine reviewed editorial pairs with MacroDiff's deterministic kit-complement model. They explain setup, protection, role coverage and damage balance; they never claim an observed win rate.