Hopefully This Cube Event Isn't a One Time thing.
Couldn't actively participate in it this time. My squad of peeps aren't near Endgame. Hell, I'm not even endgame with both my characters fresh 65 pretty much. I'm spending my time grinding endgame so I couldn't even think about running it. I tried it twice. Once solo, another with a friend who was also freshly capped and we both got demolished and at first I originally wanted the costume seeing as it's the second promo costume and thought it would be perm like the first one. Hear people say something will be done about it, then this comes around. Believed it was gonna be a free perm costume because of the "available for level 50" when my friends and I looked at the announcement. Only to find out that isn't feasible for us with current gear (or anyone actually level 55).
Not saying it shouldn't have come, just hoping it comes again at some point so we can actually try it with gear.

Comments
It's quite "free"; if you do it in a squad on Skirmish, it may take 8+ minutes to actually clear, but you'll eventually clear it and get 2 tokens, assuming that nobody AFKs.
You can do it in Assault as well. The advantage of doing it on Skirmish is that you get 2 rampage tokens, but at the cost of what is usually a Levia-filled team and a more difficult last stage. Assault only gives 1 token and is oftentimes harder to find a team for, but from what I've experienced, the improved drops and speed (Runs over 2-3 minutes are pretty rare) often make it worth doing over Skirmish.
If you have multiple characters that need costumes, though, I'd suggest Skirmish under a group.
They might do this event again, but I don't think it will be anytime soon. You still have like a week. I can help you if you are playing in EU. If you are in NA, I am sure someone would be willing to help after seeing your post
This event i think is that event comming 1 time a year.
BTW, if you do in assault, you get some -1 fatigue potions. Making the runs almost free.
Make it 15 stamina/run and make it PERMANENT!! And 3x Seha on Assault level.
Look dude this is a One event thing it will never happend again because it have so many other events that we still don't have play like the beach summer event or hallowen event.
Now only if this event didn't cost fatigue, and actually helped me towards getting endgame geared as well as not costing my ungeared ass more than one res stone a run and after today no one will be getting the full set if they haven't started doing it.
So no one who joins the game later than this event or not having the ability to participate will ever get a costume that should be permanent from the get, I gotchu.
Not necessarily. Even if the rampage cube specifically is a one time event (to which we don't have confirmation of, one way or another), that doesn't mean they won't have permanent versions of the regular agent costume available in more future events.
I second the idea of asking for help. If you really want the permanent costume now, that's the best way.
What do you mean by endgame? I've been spamming it on Skirmish in groups with my two 65 characters using the free Planar Gate gear (only about 20-25k DPS on stats and less than 20k HP). Really only Seha with his ludicrous damage or J with his endless grabs make me use a res cap. I gotta say though this event is far easier to run with the more caster-style characters who can just plop down damage like Sylvi/Tein/Levia, cause other people can really mess up combos if you're playing somebody who wants to bounce them around like Seha.
Highly recommend using the recovery capsules that heal you instantly, or sweet potatoes from the Christmas event. I also highly recommend going into game settings and changing Effect Transparency for FOE down and make ally skills more transparent.
Honestly, I've regularly been visiting with crew mates and been able to get the full set for almost 2 characters now. I do admit though, that its quite mean to those who start later. I do think there will probably be more opportunities in the future, if only to allow a chance to get the official costume sets for the characters that aren't released yet.
The event will return. It's run regularly once or twice a year, it's one of the few "filler events" for a game that's actually as good as uniquely prepared events.
How do you get the titles
They most likely may have future events reward Perm Advance Job Costumes so we should not worry too much about it.
Complete the repeatable event quest 5/10 times.
it's already mentioned, but if you have the free Planar gears for completing quests, you can get a base dmg of ~20k and be able to complete cube with 0-2 revives depending on how you dodge. but if you want squad members to run with, you can always visit the closers discord. There's always people looking to team up in the #lfg section:
https://discordapp.com/channels/346774442132766731/364458561989771264
I'm hoping theres a repeat or something, due to hurricane maria back in september i was able to get my computer back up and running from being broken with a powerplant using the phone tether to slowly download 2 days ago >.< with fatigue i cant really level in time to take advantage it seems =/ completely missed everything... was looking forward to this game since i saw the announcement in korea.