Underlord + Phoenix

Why this works

Fighting into both heroes at once can feel suffocating. Underlord drops Pit of Malice to keep your team in place, creating a perfect target area for Phoenix’s Fire Spirits and Icarus Dive. The setup seems straightforward: Underlord holds them down, and Phoenix brings the damage. The combo peaks with Supernova, where rooted enemies should be easy pickings. The issue is that Pit of Malice only roots; it doesn't stun. This means enemies trapped next to the Supernova egg can still freely attack it, and often Underlord's damage alone isn't enough to save it from being destroyed by multiple heroes.

As a game goes on, this weakness becomes more apparent. Coordinated teams will ignore Underlord and focus all their damage on the egg the moment it appears. The root from Pit of Malice can even backfire, preventing heroes from running away and instead forcing them to commit to killing the egg that is trapping them. While Fiend's Gate offers some theoretical repositioning, using it to save a badly placed Supernova is rarely practical. Ultimately, Phoenix and Underlord occupy a similar teamfight space but don't provide the hard lockdown or burst damage needed to reliably protect each other's long-cooldown abilities.