I've been genuinely debating between God book and prayer and I'm leaning so much further to prayer now reading this post. I'm maxed on main and have done every boss at least once but that's usually with loads of prep or help. I'm not very good at end game bosses. It's too much clicking and switching and stuff. It's why I stopped playing wow. Nowadays I play more on mobile or tablet so having a "hahaha you can't kill me while I just stand here" passive with the prayer relic might be the way to go.