The Seven Sects are known as the strongest seven sects of the Douluo Continent. In terms of overall strength, there are only Seven Sects that can compete with the Martial Soul Hall. The soul master world is mainly controlled in the hands of the Martial Soul Hall and the Seven Sects.
Upper Three Sects
Clear Sky Clan (Ranked First) (known for their "Strongest Tool Spirit")
Seven Treasure Glazed Tile Clan (Ranked Second) (known for their "Strongest Auxiliary Spirit")
Blue Lightning Tyrant Dragon Clan (Ranked Third) (known for their "Strongest Beast Spirit")
The reason of naming the upper three sects is that not only their spirits are strongest but also there are Titled Douluos in the sects while the lower four sects don’t have a single Titled Douluo. The Clear Sky Clan has 2 Titled Douluos namely Tang Hao and Tang Xiao. The Seven Treasure Glazed Tile Clan have 2 Titled Douluos namely Chen Xin and Gu Rong. The Blue Lightning Tyrant Dragon Clan has 1 Titled Douluo namely Yu Yuanzhen.
In fact, the Clear Sky Clan has more than 2 Titled Douluos which is a secret, hidden to the outside world.
Lower Four Sects
Note: Based on info from the donghua, the other three tribes of the lower four are speculated to be the Wind Sword Sect, the Fire Leopard Clan, and the Hornet Clan.[2]
Wind Sword Sect (Known for their martial sword souls)
Fire Leopard clan (Known for their fire based cat martial souls)
Elephant Armored Clan (Ranked Sixth) (Known as the 'Strongest Defensive Sect')
Hornet Clan (Known for their bee,wasp and hornet based martial souls)