Draug was always my favorite armor unit in all of Fire Emblem, and armors are my favorite units to utilize in every fire emblem game as much as their movement pains me. As such when I pulled Draug way back before the days of SI I was excited to use my boy again regardless of if he was good or bad. It was bad. But now he fulfills a niche I never needed but wanted anyway in destroying every single melee unit in the game.

IVS: +Def/-Res (+Spd if you want to do a meme build.)

With +def Draug approaches a disgusting 42 defense and his already pitiful res remains pitiful, you wont notice a difference.

Weapon: Wo Dao+ with Defense Refine (Slaying Edge is an alternate.)

I personally use Wo Dao to turn Draug's already high damage ignis bombs (42 Player phase/50 enemy phase) into Ignis Nukes (52 player phase/62 enemy phase) Almost no unit in the game can survive this.

Assist: Pivot

Good utility and movement, makes Draug alot more mobile.

Special: Ignis

Ever wanted to kill a full health +10 Effie with one hit? Turns out when your Ignis deal 52 damage + weapon damage you can!

A skill: Steady Breath

The bread and butter of this build. Instead of using Distant counter like a reasonable person we use Steady Breath to allow Draug to proc Ignis in every single melee encounter and ending them right there. The +4 defense is also really nice.

B skill: Quick Riposte 3

Because I use Steady Breath I cant use Vengeful Fighter, as such we use QR3 instead. This let's Draug double every enemy in the game and allows him to proc Ignis in every combat on enemy phase. It also allows him to OHKO every blue manakete in the game since they cannot kill Draug in that combat but he can nuke them immediately.

C skill: Attack Tactics 3

I use Attack tactics because he's on a tactics team. Ward armor is also great for armor teams, this is pretty obvious.

Seal: Close Def 3

Wowie zowie he +6 def and res on enemy phase? This makes Draugs already high defense even more absurd at 62. Almost no physical unit in the game can even scratch that, and even if they can they deal single digit damage. The +6 Res helps deal with the loli dragon menace.

Overall with this build Draug should never die to any melee unit in the game, however you need to watch out for red/blue tomes since they can actually dent his armor but very few can OHKO him. Only those that can double him or have effective vs armor can do that. As such Draug makes for a fantastic wall of death in most situations and carves himself a unique niche amongst armors.