Gu Xi waved at the Wyverns, and all of them descended to the ground.
As they landed, Gu Xi noticed something. Whenever these Wyverns touched down, they braced their large wings against the ground to support their bodies while folding their smaller wings back to protect their abdomens.
Gu Xi circled the Wyverns once, then focused his attention on the larger ones.
Gu Xi said a few words to his undead subordinates, and several undead quickly brought over some iron blocks.
Gu Xi had the undead place the blocks one by one onto the Wyverns' backs.
After four hundred kilograms of weight had been loaded on, the larger Wyverns could still easily take off from the spot and fly through the air with remarkable stability.
That allowed Gu Xi to understand the Wyverns' characteristics.
"Take all the iron blocks off. Bring a Zombie."
Gu Xi gave the order at once.
What followed also satisfied Gu Xi.
Having a Zombie seated on its back did not affect a Wyvern much. Even the wind blowing head-on could not blow the Zombie from the place where the Wyvern's neck met its shoulders.
At the same time, these Wyverns had no inclination to roll upside down. Their flight mainly consisted of flying straight ahead.
They relied on the small pair of wings beneath their abdomens to ascend and descend.
Their greatest feature was stability.
After letting the Zombie ride one around for a lap, Gu Xi replaced it with a Gladiator Black Guard clad in heavy armor.
If troops such as the Crimson Knights had not been unable to change mounts at will, Gu Xi would even have wanted to put them on the Wyverns.
After two or three rounds of testing, Gu Xi had recorded the corresponding data.
The larger Wyverns could carry