A very nice auxiliary weapon designed to convert your attack bonuses to damage, but only works for favored enemies. It'll work much better for the Tasha's Favored Foe option, but shhhh that's not SRD.
Some of these items also reference a couple ranger conclaves which I hope to explore in a little more detail later on.
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A weapon of interwoven metal and stone, its runes were inscribed by the Rune Callers, rangers familiar with the lands and customs of giants. Like a giant's unyielding strength, this weapon hungers for the defeat of its sworn foes, which each Rune Caller takes upon joining the conclave.
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Fury Reaver
Weapon (greatsword), uncommon (requires attunement by a Ranger)
When you attune to this magic weapon and each time you gain a ranger level while attuned to this weapon, your height increases by 1d4 inches. This change in height slowly reverts over the course of an hour if you end your attunement to the weapon.
Relentless Focus. When you use this weapon to attack your favored enemy, you have a bonus to your attack and damage rolls equal to your proficiency bonus.