It was fascinating how Lucifer twisted his own introduced devil bloodline away from his original Fallen Angel one when he fell. At its core was its essence of 'canceling the divine' it was a conceptual fuck you to anything divine that touched the grey light I could conjure up and its nature was honestly on the same level as the Power of Destruction but even more effective at its target of divine stuff.
While I made the magical girl trio of the fate universe, I didn't focus on them all too much honestly as my mind was still processing the deluge of bloodlines and even as I created their forms and even jump-started souls with them with the help of Grail. As soon as I finished creating them, I took Rias with me off to the side so the girls could imprint on Serafall as they weren't going to be mine nor did I want another younger girl creation causing trouble as Klee and her pyromaniac interests were more than enough.
"Rias let's get out of here I need some peace and quiet at the summer home," I said stretching as I felt the Levithan bloodline within my own messing around with the flesh and soul bindings that bound the Boosted Gear with me.
"Yes, that would be for the best. The Leviathan bloodline is trying to attack my own remains within the Boosted Gear and is in turn mutating to match my own bloodline due to the Serpent of the End, being so far weaker than myself." Ddraig announced arrogantly as the Boosted Gear gauntlet. covered my hand.
As I paid more attention, I could feel with my flesh crafting as well as just see dense purple/blue veins that were the Leviathan bloodline trying to push into the Boosted Gear Gauntlet but as the Red Dragon already said. The Serpent was just that a serpent and no matter how it railed, it was still lesser than a heavenly dragon.
"Alright just be careful Jake." Rias consoled me as we were teleported away to that house in the middle of nowhere where we trained for the Rating Game against Riser.
I took a deep of the clean mountain air before I leaped away from Rias so I could get some space. "Ddraig, you ready to go balance breaker and Serpent of the End at the same time?" I asked stretching as I felt the Leviathan bloodline seemingly heating up within me as storm clouds above me were also forming at the activation of the bloodline.
Granted the Sea Serpent of the End had its ability derived from Tiamat but far lesser in scope of the control over the seas or oceans but in the end turning into a dragon like creature and enhancing the control and power of water magic was the abilities bread and butter of the bloodline, so weather manipulation also played a lesser part in it.
The herald of my transformation was a rumble of thunder in the storm clouds above me and as the air shook at nature's action my body was swallowed in a powerful corona of light as I grew large and completely morphed into a more serpentine-like body but as I reared up, I realized I didn't need to make a kaiju waifu when I myself was a Kaiju.
As I reared up and began floating a raised section of my body towered the mountainous forests surrounding the summer house and as I looked around and saw how utterly tiny Rias was as she flew up to my eye level. I realized I was at least some hundred-plus meters tall as I reared up, but the total length of my body was far larger than just that as even as I magically flew into the air, I could feel much of my bodies length that held my internal organs trailing behind me in the air.
"Satans you are fucking huge Jake! I think you are probably the size of Fafnir honestly!" Rias called out as she took in my massive purple-scaled form.
"Tesssstting tesssting testing... That's better." I said trying to get used to these newer form's vocal cords. "Ddraig, you ready to go Balance Breaker?" I asked as I felt the Boosted Gear within me fit all so more efficiently within my soul with how I was in a semi-draconic form.
"Ahhh! I can feel the wind on your scales, Jake. It's like am almost reborn again Haha!" Ddraig laughed joyously and in response, I felt the red dragons flip the switch sending power within me as I triggered the chemical breakdown inside my brain and around my soul to stimulate the pressure needed to begin the emotions break that would cause Balance Breaker without selling a body part to Ddraig.
Then as thick crimson metallic scaled covered my serpentine form I could finally feel Ddraig's actual bloodline and not just the metallic scales that made up the Boosted Gear and instantly I took it within myself and I moaned out in agony as the power of the Heavenly Dragon mercilessly began shredding apart my body as it sought to mold me into another Ddraig but instead I forced the bloodline and its powerful form it wanted me to take. To instead take the form of the Serpent of the End in the Leviathan bloodline.
No matter what there was something called being too compatible with my sacred gear, and as cool as Ddraig could be. I didn't want to chance him getting impatient and taking over my body when I already promised to make him a new body for his soul to take over when I was strong enough not to need his strength as well.
"Balance Breaker!" I yelled just playing it up as Rias clapped at my new form of a stocky sort of Lindworm Dragon with all four limbs and covered in crimson red scales with some purple highlights from my previous form.
"I love this form so much more actually... It matches my hair." Rias spoke softly as she flew over to inspect my form and despite the thick metallic scales on my form, I could feel her hands slowly gliding over my form as she inspected me.
"Uh, Jake? Why aren't you getting tired?" Ddraig asked me completely confused and I chuckled with my voice coming out as a booming laughter that shook the surrounding forest and making Rias grimace at the strength of the sound.
"I integrated your bloodline Ddraig, why would it take more strength from me to assume a completely natural form? This is no longer the Serpent of the End, nor is it the Scalemail of the Boosted Gear in Balance Breaker. No this is the merged form of all those concepts merged with my own bloodline, so this is a completely natural form for me." I explained as I inspected my form and strength as I errantly used my claws to effortlessly tear through the surrounding forest and hills.
"Jake turn back human you are literally creating a small earthquake with those claws of yours and the wards weren't ready for that load!" Rias called out wryly and my large eyes blinked as I pouted at not being able to test like blowing flames or something... But saving to test that in truly uninhabited places like in the Underworld was for the best.
"Alright, Rias..." I all but whined but as my body was covered in a bright green light I continued to speak as I retook human form. "Actually, to celebrate all this how about me and you got to that new cinema that opened up in Kuoh for a date?"
Even in all the excitement of my power boost. At the question, if she wanted a solo date, Rias smiled and without a word jumped into my arms and kissed me in answer.