Comments of chapter undefined of Douluo: Twin Martial Spirits

If he has twin spirits, his level would always start at 10. Also, the reason Tang San focused on his blue grass is so that his hammer would only get the best rings. By focusing on blue grass and increasing his cultivation, he can make it so that his hammer would only have 100,000 year old rings or higher. For example, by the time he is lvl 80~90 blue grass spirit had yellow, yellow, purple, purple, black, black, black, red rings while hammer (the higher quality spirit) didnt have rings. Being lvl 80, his body and cultivation are stong enough to fill up the hammer with 8 red rings instead of a mix of yellow/purple/black/red. This way the hammer only had red rings, making it stronger.