With this mod installed you'll get attacked by some new types of enemies including Federals, Baseball Champions, Army Renegade, Synth Raiders, Natives, Escaped Vaultboys, and Longshoremen.
All of these enemies are unique though none of them are affiliated with the various factions you encounter around the Commonwealth.
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You'll encounter these enemies all over the Commonwealth and they're hostile so they'll attack you on sight. Beware.