Wizard: Starts with Advanced Meditation

The protagonist is ruthless and engages in interdimensional warfare.
(The cheat system will be fully developed as the story progresses.)
Hughes Craig, the eldest son of a declining wizarding family, awakens his memories of his past life on Earth after being poisoned. On his way to a wizarding academy, he unexpectedly discovers a mysterious ring in his storage bag, but the ring seems to be incomplete...