How do you train up Byleth? Fire Emblem: Three Houses
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You gotta rely on spamming axillary battles and facility training to get Byleth's weapon skills where you want them to be. Thankfully Byleth is gonna end up OP no matter what class path you take so if you wanna make things easy for yourself just go fighter -> mercenary-> swordmaster/assassin -> enlightened one while picking up at least C in both reason and faith for a couple of useful spells.