Arus turned his head at Robin's call and dutifully made his way over briefly wondering if he should mention the stone to Robin, he quickly thought better of it. It was Holliander's to do with what he willed, if he felt a need to share the information he would do so. Arus noticed that Robin's group had some of the inhabitants from this world in it as well, perhaps Robin wanted to get used to working with his new allies. Mentally shrugging Arus merely pulled his horse up with the others and waited for further orders, keeping his eyes open for any attacks. Though no doubt Robin already had scouts deployed an extra pair of eyes couldn't hurt.