Lone Druid + Undying

Why this works

Picking these two heroes is a bet on overwhelming the enemy with bodies. Undying’s Tombstone floods the area with zombies, creating chaos and slowing anyone trying to escape. Lone Druid adds to this problem by bringing a durable Spirit Bear to the fight, giving enemies another high-priority target they have to deal with. All the extra units make it difficult for opponents to focus the right hero. Undying can also use the Spirit Bear to power up Soul Rip for a clutch heal or burst of damage, adding a small but reliable bit of extra value whenever they fight near each other.

The plan is to force teamfights in the mid-game. A well-placed Tombstone, defended by both Lone Druid and his bear, can secure a fight and create an opportunity to take towers. The partnership can feel awkward, though, because their goals don't always align. Lone Druid often prefers to split-push and pressure buildings alone with his bear, while Undying is almost entirely focused on enabling five-man engagements. If the team can’t group up to capitalize on Undying's window of power, the synergy mostly evaporates, leaving each hero to play their own game.