The DLC for Back 4 Blood typically includes additional content such as new characters, cards, and game modes that enhance the gaming experience. This content is designed to add variety and replayability to the game, allowing players to explore new strategies and gameplay mechanics.
If a friend owns the DLC, you can use Steam Family Sharing. However, Back 4 Blood blocks DLC sharing by default. The workaround: Have your friend log into your PC, install the game, and launch it once to cache their license. Then, while Steam is in Offline Mode, you can play their DLC. This is tedious but 100% legal and virus-free.
Search for "Back 4 Blood DLC unlocker" on YouTube. Ignore the comment bots. Now, actually download the file from a description link. Run it through VirusTotal. The result will be a mix of "AI:Malware" and "Trojan.Crypt."