Fen dodged attack and evaded and with every strike they were getting killed as Fen used more power and started to slaughter them left and right with slashed, swinging, kicking and punching and in few hours there were nothing but a pool of blood and mountain of bodies as more than half of the army were slaughtered as Fen was completely covered in blood.
Looking at the bodies, the 4th commander rushed to Fen and started to attack him by swinging his axe but every strike was dodged or blocked or countered. The 4th commander dropped his axe on top of Fen head but it was blocked by Fen's katana but the power from that strike broke the ground he was stepping on as it was cracked and destroyed and Fen pushed back the 4th commander as it jumped back several meters.
Fen tilted his head as small particles of light were formed as they rushed to rushing soldiers and blasted their head, organ or limbs into pieces continuously. Fen lifted his sword and a golden glow was formed in the blade as he slashed it down and the space and time around it started to crack and a massive black hole emerged as it swallowed those thousands of soldiers and even the two messengers as the 4th commander was also being pulled but he plunged his axe into the ground and roared.
His muscles grew and he became even bulkier as his veins started to bulge with with his power and he rushed towards Fen and Fen too rushed towards him as both of them met in the middle as they started to trade blows with each other and with each blow the ground cracked and the air trembled.
After several hours of trading blows the black hole had disappeared and the ground has been destroyed to the point that it wouldn't recover. The 4th commander was huffing and puffing as he had grown tired from the fight but Fen was still normal without a trace of fatigue just looking at the 4th commander as if he was a ant which could be crushed any moment he wanted.
The 4th commander said "You are good even powerful than me with your power my brother deserved to die and let me be honored to die with your hand" as he rushed to Fen and suddenly it felt like the time had stopped for him as his head fell down and his body slumped as Fen had just slightly moved his Katana.