Jagen

Very direct, very one-dimensional, and the absolute nightmare for any dragon. On enemy phase he has 60 res at melee range, which should be sufficient for him to maintain his guard against anybody except M.Grima. He will simply bait, and bait, and bait, preventing the dragons ever from gaining special charges via steady breath, and thanks to his extremely low spd, it is likely that every other round, he will blow one up with a 48-damage glacies. (First combat, he gets doubled; second combat, he gets hit and retaliates with glacies.) He will delete entire dragon teams, probably even against triangle advantage.

Options for reducing the cost of the build:
- res+3 instead of atk/res bond. Felicia is a free unit.
- res+3 or fortress res instead of the coveted close def 3
- atk smoke can save you an Oliver.
- guard 2 is a significant concession because he can take so little damage that the difference between 80% and 90% actually matters quite a bit. Nonetheless, if you don't want to give up feathers, it will work.

Options for more versatility or more general relevance:
- take a second ploy in for a seal to help the team out
- DC will enable him to fight mages as well. You may want to switch to iceberg because squishy mages don't need 48 burst damage to kill. Fortress res probably performs better than close def for a seal.
- choose +def instead of +res, refine for def, and double up on close def for 44 res at melee range.
- reprisal lance can enable him to hit quite hard for his low base atk. With a boon IV, he starts with the same amount of atk as neutral Sumia.

A ridiculously expensive build, +def is recommended so that he can better stand his ground on both damage types rather than just focus on his huge res stat. A defense upgrade for his lance should be taken to further increase his physical tolerance, making it harder for sword units to kill him.

Anti-mage Jagen

basic 45 res with the seal and +res weapon combined with Wrath up damages from Glacies to 36

He gain +7res when attacked up to 52res and can counter with Distant Counter. Add an unit with Fortify Cavalery and Jagen will get 58res.
With 58 res, he can take 0 dmg from a green mage with 46 atk. Cancel affinity is here to protect him from green mage with triangle adept.

However be careful, mages don't do any damages or just a bit but he can easily die versus physical damages units.

IVs: +Res, -Def

The be-all, end-all build for magical counter Jagen, his possibilities have only become that much better with the 1.8 update. (and now with the 2.0 update, as shown further below!)

The main update here is the Deflect Magic Seal. When boosted with Fortify Cavalry, Jagen's res is already outstanding, hitting 38 (+res) + 6 (fortify cav) + 4 (berkut's lance), for a total of 48 resistance at base. Now adding weapon refinery, we add a +3 to Berkut's lance defensive passive and a flat +4 boost to resistance for a grand 55 resistance when defending. While before Reinhardt could easily finish him using Moonbow, Deflect Magic's Urvan-like effect will reduce Reinhardt's damage by 80%, rendering it essentially moot. B Tomebreaker is taken to ensure this especially given Reinhardt's tendency towards Lancebreaker, with the added bonus of also allowing Jagen to take on blue mages with Desperation who may otherwise get around his Distant Counter.

His kit is otherwise standard: A flexible C slot and Iceberg to take advantage of his monstrous Res, especially with a 3 cd. While the support skill is also flexible, Reciprocal Aid to keep Jagen healthy is an interesting option should he need to tank mages repeatedly.

Jagen has always been an underwhelming unit thanks to the veteran penalty, so I decided to have some fun. While playing the recent Voting Gauntlet I had the chance to play with a "meme" Gunter, fully built with a Melon Crusher, Distant Counter, and Quick Riposte. Nevertheless that Gunter solo'd the majority of the enemy teams I fought, thus inspiring me to create this Jagen.
*This is an experimental Jagen build I've been contemplating for a while now. Have fun experimenting yourself.*

A +DEF/-SPD Jagen would have HP of 37( 41 at +10), Attack of 24 (28 at +10), Speed of 21 (25 at +10), Defense of 36 (40 at +10) and Resistance of 35 (39 at +10). Defenses are all that would be needed, though.

Weapons: Ridersbane, Slaying, of Deft Harpoon all work here with this set. Ridersbane grants higher might (coverage for his low attack), Slaying with faster cooldown, and Firesweep for survivability.

Supports: Any movement support helps; Swap for placing him in front of enemies, same for Reposition.

Specials: Iceberg, unless you're using slaying lance, otherwise opt for Glacies. Alternatively Bonfire/Ignis could be used if you have Fortress Def.

Passive A: Steady Breath/Close Defence for tankiness. Alternatively Fortress Def 3 is as effective, but has an attack penalty.

Passive B: This is a little tricky. Renewal is most recommended as it allows him to regenerate HP to maximize tankiness, Guard 3 to mess with attackers (seriously when will Guard become a seal), or Quick Riposte if you do not use Firesweep lance.

Passives C: Threaten/Ploy Atk if you do not plan to use Jagen on a Horse team, otherwise any horse buffs are appreciated (Threaten Atk is still viable on a horse team, though). Threaten Def is also effective, helping to maximize tankiness.

Seals: Deflect, Def +3, or Close Defense are both viable. Def if you pair with Fortress Def 3 to increase Bonfire/Ignis damage, or Res +3 for Glacies/Iceberg (though RES is usually not as useful). Deflect Melee is most effective for deflects, working in synergy with Threaten Atk to minimize any incoming damage. Ploy variants are welcome too.