No, Issei was mountain level if he doesn't use any of his abilities.
With his main ability being doubling of his own power, exponentially.
Less "Modred says she can burst mountain, does she need Clarent NP or just a powerful mana burst.
More "Opps, I accidentally jabbed too hard while shadow boxing, the mountain is gone".
Then the guy went through DBZ powercreep "previous strongest attack can't even scratch my next power up" style.
Vol 9 he was breaking entire Kyoto size pocket dimension with mountains in it.
His power continued to escalate, but Issei specifically avoided using super moves where collateral might be too high, he's literally trained for that and it showed, like going through the trouble of lifting and restraining enemy so he can shoot Longinus Smasher skyward to prevent collateral.
World destroying power, Leviathan one of the four demon lords can casually destroy Japan have all been thrown about much earlier in WOG and in-character dialogue, but it's unclear whether it's life wipe over time or what and people ignored those as hyperbole. The new transformation having a definitive "break the planet" capability merely put those into perspective.
Think of him as someone who throw out normal Excalibur beam as a casual probing attack and escalate further from there.
Guy can get into extended slug out with people as strong as him with the planet busting form being the exception.
Speed fast enough to blitz lightning timer and weave through mass lightning. Undetermined faster in later form.
Break dimension by hitting hard enough, can survive the void between dimensions indefinitely.
Treat dimension attack and soul attack like they are regular attacks instead of durability negating haxx.
For special abilities
"Boost" Double his power exponentially, capped by his own body ability to withstood his own power.
"Divide" Halve enemy or incoming attack power by half repeatedly.
"Reflect" Reflect enemy or his own attack, capped to a certain threshold relative to his power. So enough to reflect most Noble Phantasms if we talk about current Issei. Will likely fail vs Servant Verse ridiculous NPs.
"Penetrate" bypassing enemy defenses and attack their body directly. Has been show to ignore armor, enchantment and defensive ability that completely nullify Issei's power.
"Transfer" Give the accumulated "Boost" to someone.
"Dress Break" Destroy clothing and armor. Has been shown to work on entire pocket dimension being used a restraining tool. Issei refuses to use this on male as it requires imagining the target naked.
"Bilingual" Literal boob language, talk to enemy boobs. Functionally it's mind reading, but cannot be blocked by normal mind protection because he's asking the boob, not looking into the target's mind. So far, all boobs are 100% honest.
pax superboy prime vs touma
