My System Is a Bit Useless

I accidentally traveled to another world and got a useless system. It can only be invincible for fifteen seconds and can only be used once a day. The key is that real men can use it more than once. The useless system will also issue tasks, and you will get gged if you are not careful. No matter who you are, Immortal Emperor or Immortal King, if I can't kill you within fifteen seconds, I will run away! ! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.