// initialize prefab list and its mana costs according to PublicLevel
void InitStage()
{
friendlyCreatureList = new GameObject[PublicLevel.friendlyTypeCreatureNum];
hostileCreatureList = new GameObject[PublicLevel.friendlyTypeCreatureNum];
friendlyCreatureManaCost = new int[PublicLevel.friendlyTypeCreatureNum];
hostileCreatureManaCost = new int[PublicLevel.friendlyTypeCreatureNum];
PublicLevel.PlayerStageSetting(friendlyCreatureList, hostileCreatureList);
for (int i = 0; i < PublicLevel.friendlyTypeCreatureNum; i++)
{
friendlyCreatureManaCost[i] = friendlyCreatureList[i].GetComponent <DefaultCreature>().GetManaCost();
}
}
