Solacesteel Mitigator
This weapon is made of sanctified mourningsteel. When you hit with an attack using this magic sword, the target takes an extra 1d8 radiant damage. If the target is undead, the extra radiant damage increases to 2d8. In addition, while the blade is sheathed on your person, you have advantage on Charisma (Persuasion) checks made to deescalate or avoid initiating combat.
Barbin stood at the ready. To his right, Mina had her crimson fan waiting to strike. The caravan they'd been contracted to defend, with the aid of a third quiet mercenary, had come to a sudden stop. They'd known bandits were common on these roads, but even this was uncommonly bold of them. The bandits' demands were simple and uninspired: money and goods for their lives, no one needs to get hurt, and so on. Midway through the demands, the other mercenary stood and walked from the caravan to meet the bandits. His stance was relaxed, and though his blade was of obviously good make, he made no moves toward it. He spoke to the bandits with such clarity and calm that they were all entranced. He spoke of not fighting those who could benefit, of the wares woodland bandits such as them can come across, and of a mutual trust between the wilds and civilizations. Before they knew it, they were trading supplies, at a generous profit, and were already on their way down the road again.