Fastest would actually be True Gremlin moving about in a Phase where every gap extends infinitely, showing their outside the bounds of space and time altogether. I guess you could scale Crowley themselves to that feat, since they initiated that spell in a Plank second but I’ve no idea how to measure that. One last thing to consider, all the above is taking the black void as 1 universe when it blatantly isn’t. Go by several low end statements for the amount of worlds Othinus made throughout that volume before destroying them all into that void, and you can slap at least 9 more zeros to that 1.4 quintillion, making it 1.4 octillion