It was the same for everyone as they somehow felt that their location was scanned by the nearby Sentient Arcana.
Although they are busy fighting off against the Dark Elves, the group of Sentient Arcana remained conscious of their surroundings and perhaps, they thought that Diether's group are attempting to ambush them!
"Tsk… They know we're here." Stella muttered as she touched her Spectral Cloth Vambrace. She's ready to transform at moment's notice to fight against the Sentient Arcana.
If she considered them with the same power as her Master, then she can't underestimate them and she had to fight them with her full strength or it might be too late.
"Hmm. They don't seem to be really strong though. Most of their skills are single-target. It's taking them too much time to even deal with a single Dark Elf."