Basically looking for a novel where a character fights literally using the power of his heart. Ideally its the main power he uses and not a supportive one like the one in Desolate Era. Not sure if there are any novels on this topic at all, but if you find any kudos to you, doesn't really matter from what site its from NU or royalroadl.
Just the fact that they use the "power of the heart" narrows down the choices... I don't believe there would be anything like it besides a parody or as in Desolate Era, a supportive role.
When you say you want someone who uses the power of the heart, do mean someone who uses illusion like attacks, to break the mind and spirit of their opponents? Or do you want someone whose strengths is equivalent to their determination and will.
Not sure if it's what your looking for since it's only a supportive thingy Spoiler: My theory for now atleast, he did get a fruit with the mandate of heart and has some heart martial art aswell Ancient Godly Monarch.
some people maybe disagree but i think DBZ is classical choice if you want series with heartforce if the power level difference is not too big basically the one who is more stubborn and strong willed is the one who win i.e kamehameha v.s other qi beam when they collide with each other, the one who shout the loudest will win (lol)
i guess illusions to attack, not really determination/will, a physical sense would also be nice like in ISSTH where a character's heart beat and everyone from miles away could hear it, though thats mainly do to cultivation and not having a strong heart physically.