User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-73.57.25.92-20180323210055/@comment-2601:8C:601:5692:3C7E:1CB6:535F:4949-20180330221416

I have no idea about Issei having any role in the Slashdog volumes. As for the abilities, Innovate Clear has the ability to create artificial "dimensions (or perhaps we should call them "gardens" considering the Longinus name in kanji)" similar to but less "powerful" Dimension Create. It has the nickname, "Sacred Gear that deceives God" due to its ability to even make convincing facsimiles of living things. Telos Karma has the ability to manipulate the possibility that cerain phenomena happen (or something along those lines), even going completely against the odds and overturning the results of a sequence of events, if I recall correctly. It is even more powerful in a "garden" created by Innovate Clear.

Also, some corrections about Kanzaki. Yes, it currently appears that he is not the actual owner of these two Longinus, but instead has access to their abilities through simplified mobile terminals. His nicknames are only "First Dark" and "One who deceives God". He and Kirino belong to the "erased group" "Cross Times Kiss (X×X)". This information is verified from updates on Ishibumi's blog.

Some other interesting info I've originally learned from his blog and Twitter. First, Lancelot's holy-turned-demonic sword Arondight has made its debut In Slashdog Volume 2, in the possession of Satanael. And apparently Ishibumi intends to release a "High School D×D 0" featuring the Sirzechs × Grayfia story alongside the blu-ray/DVD release of the upcoming anime season. Timeline-wise we get HSD×D 0 > Slash Dog > HSD×D > True HSD×D (apologies if this was already mentioned somewhere.