We will start scalling from point that Issei in Triania easily destroy whole Kyoto City, which we could raited as 7-B (City Level)
"Disappear! Dragon Blaster!"
BOOOM!!
The shoulder cannons fired releasing an extremely massive blast! Even as I tried my hardest to maintain my footing, I could not stop the impact from the recoil, and it sent my body backwards...! I used all my strength to stop myself from flying away!
The high output energy was fired into the midst of the Heroes Faction!
"Interesting, I will take this shot, legendary dragon!"
Heracles stepped up in front, was he trying to take my attack--
"Don't take it! Evade!"
Cao Cao yelled and used the base of his spear to hit Heracles away from the line of fire! Cao Cao and the other members then swiftly escaped my attack.
Without hitting anyone, the cannon blast continued flying onward far away behind them.
KABOOOOOOOOOOOOOOOM!
A large explosion shook the entire space while the city in the background was engulfed by the gigantic aura!
...The energy continued to spread, surrounding the entire city with intense light!
As the bright light faded, nothing was left! The cannon blast eliminated the entire scenery, and even the game field was affected and the artificial dimension began to show signs of distortion!
"...Destroyed the whole city! Hey! If he keeps firing, this dimension won't last!"
Heracles finally understood the power of my cannons, and cried out in surprise.
Second point. Issei in Triania couldn't do something agains Sairaorg in his BB even with fullpowered attaked. Absolute ZERO damage (damage even returned to Issei himself).That mean - Sairaorg in BB is far above Triania Issei (also he oneshot Triania Issei with max defence mode with casual strike) and Sairaorg in BB should be 7-A (Mountain Level)
"Now. Give me your best shot."
………….Don't regret it then. I will hit you with my maximum power!
[WELSH DRAGONIC ROOK!]
[Change Solid Impact!!!]
My armour gets thicker and my arms became several times bigger as well! I pulled back my massive fist and push it forward! I increased the power of it by using the percussion hammer located in my elbow when it touches him……
GAN!
My massive fist was easily stopped by Sairaorg-san's left hand.
….! I received the impact! You must be kidding me! It was a new technique that specialized in both offence and defence! No! I haven't finished yet! If I use the percussion hammer again to increase the impact then I will….!
BANG!
The percussion hammer is nailed down and my fist increases its……
My massive fist was easily destroyed when it hit Sairaorg-san's hand……. My defence was also supposed to have increased……!
"So this is your limit."
Sairaorg-san says that.
GAKYAAAAAAAN!
Sairaorg-san's fist went deeply inside my thick stomach and my armour crumbles easily. His fist reached through to the body inside my armour thus destroying my body.
"Gough!"
I spit out a lot of blood from my mouth. Then I lost conciousness.
Third. Issei reach the CxC mode and easily fight on equal with Sairaorg (plus we should not forget that current CxC is stronger than in volumes 10-21 because it was enchanes by second Dragon Godification (DxD G mode) )
Grendel should be only little stronger than Issei in Cardinal Crimson (CxC mode) and Sairaorg but he has highest endurance and he could fight with them both a short time (he lost but still could fight and damage them both). So he 7-A, possible (or likely) higher. Grendel was raited by Issei as someone who at least as strong as Tannin if not a stronger.
Rias ultimate move could turn whole his body into nothing with easily, and also in Volume 21 Issei said that each of Sirzechs casual attaks in True form comparable if not a stronger than Rias Ultimate move.
Also Issei have Longinus Smasher. His ultimate move that could easily defeat a Grendel-class opponent with one-shot even in CxC mode.
In that case we have:
All characters comparable with Ultimate class devils is 7-B (Rias (without armor and ultimate move) and Akeno form Vol.23, Issei Triania, Vali BB, Bikou, and so on, Kokabiel)
At least 7-B, likely 7-A for Ni├░höggr
All characters comparable with Satan-class is 7-A (Issei CxC, Sairaorg BB, Grendel, Serafall, Grayfia, Ladon, Cao Cao BB, base Euclid and so on, Azazel,) or at least 7-A (Diehauser Belial, Euclid replica BG, Issei with Longinus Smasher in CxC and in Incomplete JD, also Sairaorg in Breakdown the Beast)
Gods in completly different level. Loki could easily block fullpowered attaks from Azazel and Barakiel in the same time, also them both comparable with Issei CxC (Barakiel even little weaker than Issei CxC from Volume 22)
"Lokkkkkkkki!!"
Sensei and Barakiel-san each released a spear of light and holy-lightning at Loki with maximum output.
"Even without using Fenrir, just two mere fallen-angels won't be able to stand a chance against me."
A magic-circle with an equation I've never seen before becomes his shield which expands throughout the sky.
Sensei and Barakiel-san's attack was easily blocked.
So usual Gods should be High 7-A (Odin, Loki, Rizevim, Vali in EJOD and JD, Issei in pseudo-DxD)
And High-class Gods from top-10 strongest author mentions and Heavenly Dragon-class guys at least 6-C because they could casual defeat usual Gods (Issei in true DxD, Vali in DxD L, Fenrir in prime, Typhon, Indra, Ddraig and Albion, Sirzechs and Ajuka, Azi-Dahaka and Apophis)
Also there Crom Cruach who surpass Heavenly Dragons in their prime EVEN IN BASE according to volume 23. He should be as strong as weakend Ophis
And finally Shiva who much stronger than anyone higher except Great Red, Prime Ophis and Trihexa. He possible High 6-C or Low 6-B
