The MC bursts balls from others which he can absorb to get stronger. There are the following balls and thier abilities they can give him:

Red Ball: This is the Power Attribute ball. I interpret this power as physical strength, lifting power. Anything associated to the body

Blue Ball: This is the Speed Attribute Ball. This is anything related to Speed, like agility, dexterity, reaction time

Yellow Ball: This is the Defence Attribute Ball. Anything related to defence like bone strength and toughness, muscle density

Green Ball: This is the Flexibility Attribute Ball. This is the body's flexibility and him being able to act under stress. This includes him bearing stress on his body like pressure or killing intent from an enemy

Black Ball: This is the Spirit Power Attribute Ball. Absorbing this increases his Spirit Power, when he is at the peak of a Rank and doesn't absorb a Spirit Ring, further absorption of this ball increases density and concentration as well as quality and purity of his Spirit Power

White Ball: This is the Mental Power Attribute Ball. This increases strength, quality, concentraion and purity of his Mental Power. It also helps in enduring backlash from absorbing Black and Red Spirit Rings

Golden Ball: This is the Best Ball. This can give the mc an ability his opponent has. This can be a technique like Chaotic Cloak Hammer or Martial Spirit. Every person can only burst 3 Golden Balls and that's it. No more beatings will burst another from him.

In Douluo Dalu, a Spirit Master gets their spirit ring every 10 rank. Starting from rank 10, rank 20 and so on.

Rank 1 - 10 : Spirit Scholar

Rank 11 - 20 : Spirit Master (Has One Spirit Ring)

Rank 21 - 30 : Spirit Grand master (2 Spirirt Rings)

Rank 31-40 : Spirit Expert (3 Spirit Rings)

Rank 41-50: Spirit Ancestor (4 Spirit Rings)

Rank 51-60 Spirit King (5 Spirit Rings)

Rank 61-70 Spirit Emperor (6 Spirit Rings)

Rank 71-80 Spirit Saint (7 Spirit Rings)

Rank 81-90 Spirit Douluo (8 Spirit Rings)

Rank 91-98 Titled Douluo (9 Spirit Rings)

Rank 91-94: Average Titled Douluo

Rank 95-98 Super/Hyper Douluo (At this stage, 1 rank 95 is as strong as 1 rank 94. 1 rank 96 is as strong as 100 rank 95's. You get the idea)

Rank 99: Limit/Peerless Douluo

Rank 100: God Officer

Rank 101 - 110 : 3rd Class God (3 Divine Rings)

Rank 111 - 120 : 2nd Class God (5 Divine Rings)

Rank 121 - 140 : 1st Class God (7 Divine Rings)

Rank 141 - 149: Qusai God King

Rank 150 ~ ? : God King (9 Divine Rings)

Rank ???-??? Supreme God King (fused with his God Realm)

Divine Ring [神环]

God Officer [神官] (1 Divine Rings)

3rd Class God [三级神祇] (3 Divine Rings)

2nd Class God [二级神祇] (5 Divine Rings)

1st Class God [一级神祇] (7 Divine Rings)

God King [神王] (9 Divine Rings)

Spirit Beasts:

1-100 Years White Spirit Ring - Comparable to Spirit Scholars

100-999 Years Yellow Spirit Ring - Comparable to Spirit Masters and Great Spirit Masters

1000-9999 Years Purple Spirit Ring - Comparable to Spirit Elders, Ancestors and some Spirit Kings

10,000-99,999 Years, Black Spirit Ring - Comparable to Spirit Emperors, Spirit Saints and Spirit Douluo's

100,000-999,999 Years Red Spirit Ring - Comparable to Title Douluo, as the age increases so does their strength. A 100,000 is like an average Title Douluo, a 200,000-300,000 is like a Super Douluo, a 400,000 and above is comparable to Limit/Peerless Douluo

1,000,000 Years Gold Spirit Ring - Comparable to a God Officer

Blacksmith levels from highest to lowest:

Divine Craftsman

Smith Scholar

Grandmaster Smith

Master Smith

Advanced Smith

Intermediary Smith

Junior Smith