WotC always has been having fun with the disclaimers of all of the 5th edition books. This continues with Sword Coast Adventurer’s Guide.
Wizards of the Coast cannot be held responsible for any actions undertaken by entities native to or currently inhabiting the Forgotten Realms, including necromancer lords of distant mageocracies, resident mages of any or all Dales but especially Shadowdale, drow rangers wielding one or more scimitars and accompanied by one or more panthers, mad wizards inhabiting sprawling dungeons accessible via a well in the middle of a tavern, beholders who head up criminal cartels, and anyone with the word Many-Arrows in their name. In the event of a catastrophic encounter with any or all such entities, blame your Dungeon Master. If that doesn’t work, blame Ed Greenwood, but don’t tell him we told you that. He knows more archmages then we do.