Knights from the Sacred Army, although as stated in the description, they aren't particularly strong due to being normal folk that enlisted voluntarily in the Army without any basic knowledge of how to fight against actual knights such as those that fill the ranks of the Grand Bell. They are the first enemies the player will meet, and as such, they don't have much to them: they can either do a weak physical attack, which can be easily blocked, or increase their attack and defense by a marginal amount through a skill called Boost. Therefore, they shouldn't pose any problems to the player.
The version found in the first battle against Targana in the Bell Strike Hall is significantly stronger than the normal ones found in the Rakshek Resort, but they still pale in comparison to other enemies found at that point in the game and against the player's party due to their higher levels and improved equipment, so they most likely will be wiped out in a Song Magic blast, allowing the player to concentrate in defeating Targana.