Losing himself in the green sam came to know that along with the ultimate nature manipulation he had aquired other abilities as well.
In physical form, the Swamp Thing was a chlorokinetic-transmorphic elemental entity, an Avatar of "The Green" (the plane of existence for the hive-mind and life force of all plant life on Earth). The Swamp Thing can inhabit and animate vegetable matter anywhere, including alien plants, even sentient ones, and construct it into a body for himself. As a result, bodily attacks mean little to him, he can easily regrow damaged or severed body parts, and can even transport himself across the globe by leaving his current form, transferring his consciousness to a new form grown from whatever vegetable matter is present in the location that he wishes to reach.
so he had gained unparalleled regeneration with elementalization ,physical attack which was the main mode of attack of Raktabija just lost its effectiveness on him .
using His new form a gaint titan made of trees and vines arose from the ground and strode towards
the Asur . He was the nature himself so with just a command all the clones were bound by him in just a second. The surrounding fauna covered the asur and just like that the battle ended.