At the Smithy in the Somniel, you can engrave weapons with Emblems, to greatly enhance their stats. Each Emblem can only be engraved to one weapon.

Icon	Emblem	Engraving	Mt+	Hit+	Crit+	Wt+	Avo+	Ddg+
	Marth	Beginnings	1	10	10	—	5	5
	Sigurd	Holy	1	—	—	-1	20	—
	Celica	Echoes	-1	—	—	-1	—	50
	Micaiah	Dawn	-3	—	—	-1	40	20
	Roy	Binding	2	—	—	8	-30	—
	Leif	Genealogy	1	20	—	1	10	—
	Lucina	Awakening	-1	30	—	-1	30	—
	Lyn	Blazing	-3	40	20	-2	—	—
	Ike	Radiance	3	—	—	15	—	—
	Byleth	Academy	—	30	10	2	10	30
Icon	Emblem	Engraving	Mt+	Hit+	Crit+	Wt+	Avo+	Ddg+
	Corrin	Fates	-2	—	30	—	10	30
	Eirika	Sacred	—	40	20	—	-20	-20
	Alear	Fire	-1	20	20	-1	20	20
	Edelgard	Rivals	1	10	10	1	10	—
	Tiki	Dragons	2	—	—	—	-20	-20
	Hector	Strength	3	—	—	3	-30	-30
	Veronica	Heroes	1	-20	-20	-2	20	20
	Soren	Acumen	2	—	—	—	-10	-20
	Camilla	Revelation	1	—	30	1	-20	-20
	Chrom	Bonds	1	—	—	-1	20	20