Luna + Ringmaster

Why this works

Picking these two together presents a tactical puzzle in teamfights. The core problem is that Ringmaster's abilities often want to pull enemies into a tight clump. This setup works against Luna's main sources of damage. Her Moon Glaives are most effective when they can bounce between slightly separated targets, hitting more unique heroes. More critically, a powerful Eclipse relies on isolating a single enemy to focus all the beams on them. When Ringmaster gathers the entire enemy team into a ball, he ensures Luna's ultimate will spread its damage thinly instead of deleting a priority target.

While Ringmaster's lockdown can help Luna secure kills with Lucent Beam in the laning stage, their late-game spell usage feels disconnected. For their ultimates to work together, one hero has to compromise. Either Ringmaster avoids using his big pull to set up for Luna's Eclipse, or Luna accepts that her ultimate will be much less of a nuke. This awkwardness means that while they can function, they don't amplify each other's biggest strengths when it matters most, leading to teamfights that feel less decisive than they could be.