A Raging Barbarian has resistance to certain types of damage. An unarmed strike by a class with 0 Strength, for example, does 1 point of damage (not talking about Monk's unarmed strike, just a regular punch).
Does the Barbarian's resistance make him immune to 1-damage attacks? Since the damage is halved and rounded down. Or is there a minimum damage value (namely, 1) that cannot be resisted?
I'm asking because I've decided to create a plague of flesh-eating scarabs, with 1HP and that do 1 point of damage. However, there are hundreds of them, the PCs will have to stay of out reach and use low-level AoEs or simply escape from them. These scarabs do damage by being in contact with enemies, no Attack Roll required, but I don't want the Barbarian do be immune to it.