fuindordm
Adventurer
If you're worried about rogues, the sneak attack description says that they get the extra damage dice if an ally is within 5 feet of the opponent and the rogue does not have disadvantage on the attack.
So SA works even if the ally isn't actively helping, and they don't have to flank 3E style, just double-team.
So SA works even if the ally isn't actively helping, and they don't have to flank 3E style, just double-team.