697. Breakthrough

The best way to push his mind over the boundary of the fourth rank was the fifth Kesier rune.

The Kesier runes were the best training method for the sea of consciousness, as well as the safest.

Noah simply made sure that his mental sphere was stable before taking the sheet containing the fifth rune and starting his training session.

The internal pressure inside his mind intensified as the details of the rune became more material, and the walls of the sphere struggled to cross the invisible barrier that blocked their expansion.

Then, the fifth Kesier rune wholly materialized inside Noah's sea of consciousness, and a stabbing pain forced him to close his consciousness to endure the tremors that its materialization caused.

A humming sound echoed inside his mind and spread in the outside world through the mental waves that he unconsciously leaked during the process.

The sound was soft and subtle, but there were two existences in the separate dimension that didn't fail to hear it.