this question really stuck with me. The rivalries aren't just about who's stronger, right? With Lucas Wycliffe, it's pure, venomous class conflict from day one. Arthur is this powerful commoner-adjacent kid at a noble academy, and Lucas embodies the entire rotten system that looks down on him. It's social resentment wrapped up in magical competition. Then there's the stuff with Elijah—Katherine's brother. That one's so much more personal and tragic. It starts as a friendly sparring dynamic, two prodigies pushing each other, but gets poisoned by external lies and Katherine's machinations. The real conflict there is the betrayal of trust, not the magic. Arthur wants a genuine rival and friend, but the deck is stacked against him by forces he doesn't initially see.
And we can't ignore the broader rivalries either, like with the Wyvern Sovereign or even earlier antagonists in his past life. Those are clashes of ideology and survival. But the ones that define his growth, for me, are the personal ones—Lucas representing the corrupt world he has to operate within, and Elijah representing the personal cost of his reincarnated existence and the collateral damage it can cause. The latter hurts him way more than any duel ever could.