Why can’t Sudarshan chakra harm Mahadev?

Why can’t Sudarshan chakra harm Mahadev? Because Sudarshana Chakra is not that powerful. Simple….!!!!! However, The case is vice versa. Here Sudarshana Chakra can't harm Mahadeva. On other side, Shiva's Trishul can't harm Narayana. Both Shiva and Narayana are beyond death. No weapon can anyhow harm them. Thankyou.