Ooooh.... what do you mean when you say, "It will be taking the place of the standard "vanilla" server" ?
Being a larger server, it has a Bungeecord proxy hub. The hub links to Creative, Factions/PVP, Vanilla, and Minigames. These are actual servers, not worlds. Vanilla would not mean a JAR straight from mojang, but it does mean minimal to no ability beyond standard minecraft, a typical survival server.
Usual "No griefing, be nice to others" ruleset applies (unlike Factions where it's your job to be an asshat), and I'd allow for a few /homes and /spawn. Obviously all the moderation tools would be in place, including Prism, but it would not be available to the players. Any staff which would have that ability to do more would be required to only use it for moderation purposes, and would get in trouble if using them for normal playing.
Layout of the hub:

The server would be accessible by going to the gate behind you when you spawn, and then to the gate for vanilla. I'll probably add a simple GUI menu (right-click compass, click world) to make it simpler, but it doesn't have it for now.
If you're worried about fenris, it was done using creative mode anyway, and we have a space world on the creative server. Pretty simple math there.