how do I build eldigan

Can you call it a pity breaker if in the same summoning session, you get a focus hero?

Eldigan does a lot of what Brave Roy does but arguably better because his prf weapon gives him the accelerated trigger automatically rather than being conditional like B!Roys. Get heavy blade on there on top of it all and give him galeforce then watch him blast through the enemy lines. Sing him? Give him hone Calvary? And you got yourself perhaps the most aggressively minded red horse in the game.

Give him Fury 3, refine his weapon to be Fury 3. Then slap Vantage on him. QR sacred seal is ok, though with double Fury it only works once. Even better, give him Heavy Blade sacred seal. Give him Ignis as a budget option, or Aether to make him a sort of angrier Ike on a horse or Galeforce to make him an angrier, slower Roy. Could also do refined weapon+Life and Death for maximum offence, but he has pretty good defence so you don't really want to lose that. For a more expensive build you could refine his weapon and give him Distant Counter to make him a better Marx/Xander. He's pretty flexible now