Though they could use potions and elixirs, it was just delaying the inevitable. Unlike them, the Andromedas can continuously pressure them without tiring out and the more time passed, the more stronger the Andromedas became.
Of course, the Andromedas weren't actually becoming stronger, it's just the humans slowly running out of stamina. Additionally, the Andromedas were continuously scanning them, their attack patterns and skills, and processing all that data to find the optimal strategy to fight them.
After a while, the Adromedas started adopting the tactic of attacking from the distance and mainly targeted the mages in the backlines providing powerful AOE magic.
"It's a chaos down there. It's too bad, I wanted to show them hell myself but from the looks of it, there won't be many of them surviving after this" Bea said enjoying the show that was going on at the base of the mountain.