The addition of Heroes has also made the game similar to single player RPGs, as most Heroes have their own side quests the player can complete if they choose. Depending on which Hero you bring on quests, they make different comments on the current situation, whether remarking about ease of enemies during battle or random comments while standing around. Heroes also allow more freedom when playing as a single player with only computer controlled party members since they can be given more commands than ordinary henchmen and their skills can be tailored to specific situations. The addition of commands and customization makes many challenges that would have required other human players without Heroes possible. The hero system has also led to many "Guild Wars" players highly recommending "Nightfall" as a good starter campaign for newcomers to the game, as it encourages more strategic thinking and also makes playing PvE more straightforward (as especially in the earlier stages of the game, heroes may be of a higher level than henchmen and offer a better degree of survivability). This advice is not always sound since Heroes need to be equipped (which can be very costly) and their skills need to be unlocked (except for their starter skills).