|This build aims to utilize Parthia's special skill weapon refinement in order to maximize Jeorge's mage-counter potential, while at the same time assisting the rest of his team in taking down the enemy. The +6 attack the skill gives during combat (against bow/dagger/magic/staff) along with the 30% damage reduction to the first attack (if in combat with a foe that uses magic) synergize nicely in the killing and surviving of mages. Although Jeorge is not the best archer among the Order of Heroes, this build helps make the most of his stat spread and weapon skill, and is versatile for different situations.
Draw Back and Reposition play into his assisting role; Draw Back can be used to prevent an ally from being attacked or just for positioning purposes, while Reposition can be used to take a front-liner out of a mage's range and, potentially, set up Jeorge in a position to counter-attack. Moonbow and Luna are the best special skill options as the defensive reduction helps secure the kill with Jeorge's average attack.
For the A skill, it depends on whether you want to take an offensive or defensive approach; both Mirror Strike 2 and Mirror Stance 2 grant +4 atk/res, but the prior is when Jeorge is the attacker and the latter when he is the defender. Both work great with the Parthia skill, giving him +10 attack when the opponent uses bow/dagger/magic/staff. Mirror Strike 2 is a good choice if you want to kill that one annoying mage, but maybe kill some fliers too. If your team could benefit more from a mage-tanker, Mirror Stance 2 would be the way to go (Death Blow 3/Warding Stance 3 may also be viable options, but given Jeorge's stats with mediocre res and attack, said skills could limit his survivability/killing potential, respectively).
For the B skill, Cancel Affinity 3 is useful when considering all types of mage builds; while the B skill could be worked around and adjusted if lacking a Mathilda/Innes, it is important to remember that this build's primary function is Jeorge as a mage-killer, and with him as a bow unit, the -raven tome + Triangle Adept combination is his greatest threat (mage-wise). Cancel Affinity 3 gives Jeorge the comfort and versatility to be used in most situations. Quick Riposte 3 is another option for defensive play, which allows him to follow-up attack speedier mages.
For the C skill, Breath of Life 3 can help heal up your team in long, multi-map scenarios, or even heal up that tank who took a bit more damage in a matchup than you would have liked. If going the defensive route, I do not recommend using Breath of Life 3, as most of your strategy should involve using Jeorge to bait out mages rather than initiating. Spd Smoke 3 works well both offensively and defensively; whether striking first and debuffing the enemy team or setting yourself up for the perfect counter-attack, it can help your team get an edge over the enemy.
For seals, you want to go with the one that is not already an IV boon. While some builds and units benefit from stacking one, this build stands to benefit from a little of both, given Jeorge's stat spread. Deflect Magic 3 is solely for countering Reinhardt and should be considered if you're building Jeorge more defensively.
If offensive, this build synergizes well with units that can increase Jeorge's mobility (i.e. Reposition, Guidance, Sing/Dance). If defensive, this build synergizes well units that can buff Jeorge's stats (i.e. Rally Attack Speed/Resistance, Hone Attack/Speed).