They had found less than a dozen of Sky Giants and some Stone Giants, which shouldn't be here. Those were complete Giants, not like Volig, who was half-giant. Their size where a little bigger than the most significant size Shingi had seen Volig being able to take with its size-changing ability he got from L'liw.
Stone Giants had a more outstanding defense but were slower than the Sky Giants; even if there was a Sky Giant in the fight with the Stone Giants, it would try to increase the speed using Air-Based Spells.
After each fight, Shingi tried to gather materials from the corpses of the Giants and keep them in the Ice Mana box to keep them fresh. He and Hineko could try to make Giant Strength Potions like the one they found in the past and Wild Tycoon still had.