The reason of redesigning it was cause of this form portraiying a perfectly formed with both of his components in perfect sync.
J.J's dragon abilities are at their highest level, increasing his magical and physical output. This form also causes his armor to be as dense and durable as an land dragon's would be.That he moves at the speed of a flying sky dragon while containing the regenerative ability of a sea dragon.
His fighting style Dragon Henshin has been upgraded.He has also gained a new technique called "Nymphia's Reaping Fear". It's his strongest technique were he uses his dragon tails, he inputs all his magical power then splits them into more tails and rapidly penetrates the enemy's source of exsistance. (a soul, core etc whatever keeps them alive/exsisting). This leads to a large amout of physical, mental and spiritual damage upon the opponent resulting their death.
Draw backs of this form is that if J.J wants to permenantly stay in this form he has to extract his life as a dragohog living on mobius and turn into a celestial being living within the spiritual world/heavens.
If J.J releases this form it results several things :
1.His Components Split and Cant reunite for a month.
2. all the damage he has gained in this form and all the energy he has used shall be re-felt which can result Fainting or Death
3. DDY is set free and released from any of J.J's control.