Sepeon the Sea Serpant is the second beast Tom faced him in the second.
Sepron has a long, green, scaly body with green seaweed like hair. He has sharp white teeth and green eyes.
Sepron can swim really fast and has incredible strength, when he is under his curse he causes tidal waves.He also has really sharp and powerful jaws. He can use his powerful tail to tow boats behind him.
When Tom and rohit first meet Sepron they have to face him in an underwater battle, the source of Sepron's enchantment is the collar around his neck, the only difference is that it is attached to an island by a large, golden chain. When they manage to get the collar off Sepron returns to normal and gives Tom one of his teeth.