Necrophos + Weaver

Why this works

Pairing a durable frontliner with a slippery damage dealer seems solid, but these two heroes want completely different kinds of fights. Necrophos thrives in long, drawn-out brawls where his aura and sustain can grind the enemy down with magic damage. Weaver is a physical damage skirmisher who wants to hit-and-run on a single target. Weaver's armor reduction from The Swarm doesn't help Necrophos at all, and neither hero brings a reliable stun to hold a target in place for the other. They function as two independent heroes who happen to be on the same team.

This leads to disjointed mid-game engagements. Necrophos will naturally want to group up and pressure objectives, creating a slow-moving deathball. Weaver’s entire kit encourages him to play on the edges of the fight or split-push, looking for solo pick-offs. This forces a difficult choice: either Weaver plays uncomfortably close to the group where he can be controlled, or Necrophos's team feels like they're fighting shorthanded. An aware enemy team will exploit this by either collapsing on the main group when Weaver is away, or ganking the isolated Weaver knowing his team can't respond in time.