The strategy for defeating The Dark Heart is extremely straightforward as it does not serve as the main threat in the fight. It will only periodically launch meteor strikes that are easily avoidable, and fire tornadoes which can be much harder to dodge. These tornadoes are the more dangerous of the two attacks as they usually spawn in pairs. Damaging The Dark Heart is also straightforward as it has a few weak points per damage phase that you will need to target to destroy to complete each phase.

The key during the fight is to constantly be moving, and take short breaks to deal burst damage to a weak point until it is destroyed, then recover and deal with the zombie threats, and then repeat until the phase is over.