Huskar + Wraith King

Why this works

Picking these two cores together creates a huge problem for the enemy team: who do you focus? Huskar wants to jump in with Life Break and draw attention, getting more dangerous as his health drops. While the enemy is busy trying to burst him down, Wraith King is free to walk up, land his stun, and deal a ton of right-click damage. If they switch focus to Wraith King, they have to kill him twice because of Reincarnation, which gives a low-health Huskar all the time he needs to clean up the fight. The combined pressure from two durable, hard-hitting frontliners is often too much to handle.

This duo hits its stride in the mid-game, controlling Roshan and forcing fights deep in enemy territory. Huskar finds a target, and Wraith King provides the lockdown and sustained damage to secure the kill. The opposing team is forced to play defensively, trying to split them up or hoping to survive long enough to find items that can counter both heroes, like break effects or heavy control. If Huskar and Wraith King can maintain their tempo and not let the game go super late, they can run away with the map before the enemy carries ever come online.