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5 riddles: 1) I am your most loyal companion, but if you sink into darkness, I will leave. Who am I? 2) If you keep me alone, I will survive. But if you share me with others, I will disappear. Who am I? 3) I am very fragile and weak; sometimes just a small breath or a heartbeat is enough to kill me. Who am I? 4) I am always right in front of you, you are always walking towards me, but you can never reach me. Who am I? 5) I possess countless spaces but not even owned a single room to live in. I allow you to enter or control. I own dozens of keys, but none of them can open any lock. Who am I? (In case the MC's text cover the riddles)