Other than personal preference on the "clutter" that the ParagonWiki contact format (with all details of all missions included), it looks great. Of course, personal preference shouldn't matter - if you like it that way, it's
your arc page, and there is no "this way or no way" here on Ouro.
Minor note, you've got "Custom Enemies" and "Archvillains" switched around. Custom Enemies is to let players know who avoid custom enemies (because they're typically much harder), Archvillains is for listing specifics for AVs you've got. (See example in
MissionBox page.)
Also, feel free to make a personal page for your custom enemy, Grimoire! There, you can upload a picture of him and show off his background/powers/etc. For example,
the Lizardmen Dr. Aeon from
The Butterfly Effect.
Also additionally, remember you can use {{
Grim and the green Nav}} at the bottom of your pages for navigating between pages without having to scroll up to click the breadcrumb links at the top, or hitting the 'back' button. To avoid including them in transclusion from mission subpages, you need to 'noinclude' the template. That is done like so:
<noinclude>{{Grim and the green Nav}}</noinclude>
...that tells the entry doing the transclusion to ignore that part of the transcluded page's source.
EDIT: I added two enemy templates, if you'd like to include the "Enemies" section in your mission pages (on ParagonWiki, found below "Mission Objectives", typically followed by a "Notable NPCs" section to specify named enemies).
{{PwikiEnemy|Enemy Group Name}} for canon groups (links to ParagonWiki)
{{OuroEnemy|Enemy Group Name}} for fictional groups here on Ouroboros Portal (links to their page on Ouro)