Throughout the journey, Reiger and his group had adhered to the strategy of avoiding combat as much as possible.
Their goal was merely the water from Cadmus Spring, and they had to fight a Lv.6 Strong Dragon, so they saved every bit of energy possible to focus all their efforts on battling the Strong Dragon.
Reiger even instructed Rephia not to use magic unless absolutely necessary, to avoid wasting spiritual power.
Although Rephia had many potions for restoring spiritual power, considering they still had to reach the 59th floor and would face many battles along the way, it was best to conserve resources wherever possible.
This was also a policy promoted by Finn—after two weeks of expedition, the clan's resources were almost depleted. In order to have supplies for the return journey, minimizing the use of items and medicines was of utmost importance.