The epitome of the wandering “knight errant” of the wilderness, the Ranger Knight is actually quite comfortable with civilization and will move from rural, to urban, and then to wilderness with nary a concern save for the most effective way they can protect their charges and combat their enemies. Their presence, both open and hidden, has proven the deciding factor in the survival of many a settlement in the face of invading goblin hordes and rampaging troll warbands.
At 3rd level, the Ranger Knight is able to add their Proficiency Modifier to the damage from successful weapon attacks against Favored Enemies.
When reaching 7th level, the Ranger Knight gains Advantage all Attacks and Saving Throws when defending the weak and the helpless from immediate danger or threat. This includes the defense of fortifications where innocents are not in the direct line of fire but does not include situations where the Ranger Knight has sought out their opponent. This would also include a rearguard defense while wounded of a group flee the site of battle.
For Ranger Knights of 11th level and greater, their mere presence grants companions and allies Advantage on Saving Throws against Fear and similar effects. They also have Advantage on attempts to rally troops or other related activities.
Finally, at 15th level, when fighting a Favored Enemy, a Ranger Knight will make a Critical Attack on a 19 or 20.
This is an attempt to create a “Ranger that feels like a Ranger” because I’m not a huge fan of either Beastmaster Rangers as the default or that thing they call a “Hunter” in the Player’s Handbook. So with this I think we get a bit closer to my idea of a Ranger, a bit more Aragorn, a hint more of 1e rather than 2e or later. I expect that I should come up with an “”official list” of potential Favored Enemies for my game world as well, given the changes in commonality of some creatures.