It's a pity that this spell has been lost with the fall of the Nesserel Empire.
Only within the various documents left by the Arcane Empire can one see the descriptions of this miraculous magic.
"That's enough. In ten days at the latest, the Felen Allied Forces led by King Yasan will fully land at Tavelan. At that time, you will no longer be fighting alone, and even if they break through the Lake Asen defense line, we will still have the power to fight." Gaven was very clear about the broad outline of this war, "If the Tukan People really want to attack via the ice surface, I have prepared a big surprise for them, ensuring they will be in unbearable pain, but it requires your cooperation at Lake Asen."
Knowing the development outline doesn't mean Gaven doesn't take action and lets the Tukan People cross the lake for free.
Making effective use of the resources at hand to deal damage to them is the key to victory.
