public void PromoteUnit()
{
int manaCost = Adventurer.GetPromoteCostForClass(setClass);
if (GameDataManager.Instance.SpendManaIfPossible(manaCost))
{
adv.PromoteToTier2(setClass);
shell.Close();
}
else
{
shell.SurrenderFocus();
insufficientResourcesPopup.Open();
}
}