Q. If a creature makes a melee attack against a helpless enemy that has Conceal, does the attack have a chance of missing? What if the enemy is Incorporeal?

• 如果有个生物对一个隐蔽的无助生物进行近距攻击，有可能会失误吗？若对象是无实质的无助生物呢，会失误吗？