Very good idea author, although something could also be done so that the tree of virtues ended with sacred power and the tree of sins ended with demonic power.
'But at the same time…' I'm a major fan of using every tool at your disposal, and locking myself out of multiple Branches just doesn't sound all that appealing.
You should give Lucas some upgrades and tone down the fanaticism a bit. It's understandable that you might become a bit of a fanatic because of the story. But in the end, in my opinion, Lucas should become strong enough to not need faith.
Ch 24 The Power Of A Demon
The Journey of Elrath's Chosen(Warcraft/M&M/Runeterra)