Runic Empowerment

After a period of time spent studying the works of a Skiltgravr (“rune cutter”), or learning directly from one yourself, you've become able to augment your martial prowess by invoking the supernatural power of a giant's runes. You gain the following benefits:

• You gain proficiency with smith's tools.
• You learn two runes of your choice from among those available to the Rune Knight Unearthed Arcana. If a rune you use requires your target to make a saving throw to resist the rune's effects, the saving throw DC equals 8 + your proficiency bonus + your Intelligence modifier.
• Whenever you finish a long rest, you can touch a number of objects equal to the number of runes you know, and inscribe a different rune onto each of the objects. To be eligible, an object must be a weapon, a suit of armor, or a shield. Your rune remains on an object until you finish a long rest, and an object can bear only one of your runes at a time.
• At 15th level, you can invoke each rune you know from this feat twice, rather than once.