Right now there isn't any real item that says "I have done everything in the game and junk". Considering there are no costumes that show this period, and there are no armors that show this considering they can be unbound and sold which eliminates any real value in my opinion.
So, I think that players should receive a Volcanic / Divine / Shadow themed Proto Armor, based on which proto armor and color scheme they chose in the beginning.
These would be COSTUME items or 0 STAR items identical to proto. This way, it isn't unbindable, as these are supposed to have value to them.
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To keep the starter proto armor chosen by the player unique to the player, the armor you receive will be like this:
If you chose Spiral Pith Helm -> You get a Spiral Pith Helm.
If you chose Spiral Tailed Helm -> You get a Spiral Tailed Helm.
If you chose Spiral Sallet -> You get a Spiral Sallet.
If you chose Spiral Cuirass -> You get a Spiral Cuirass.
If you chose Spiral Brigandine -> You get a Spiral Brigandine.
If you chose Spiral Culet -> You get a Spiral Cullet.
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The color you receive will be based on the hue of the secondary color of the color of your original Proto Armors.
If you chose Toasty or Heavy Proto Starter armors -> You will receive Volcanic Proto costume.
If you chose Dusky or Fancy Proto Starter armors -> You will receive Shadow Proto costume.
If you chose Military, Regal, or Cool Proto Starter Armors -> You will receive Divine Proto costume.
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Now, how to obtain. As stated earlier, we need an armor that says "I have done it all" for players, which is not tradable.
You obtain this after you have done the following:
1. Completed every achievement.
>> Self explanatory
2. Defeated and gained clearance to all Tier 3 Shadow Lairs.
>>I bolded "and" because you not only have to defeat Darkfire Vana, but you have to defeat all other SL in order to gain access to it as well to meet part of the criteria to obtain the special Proto costume. I bolded "all" because that means any FUTURE Shadow Lair added must be completed. Yes, shadow lairs have tiers to them.
3. Get on the leader boards for either Lockdown or Blast Network
>>Not difficult, you don't even need to be good at either. You just have to play a lot of it for however long it is until the leader boards reset.
NOTE: I am not big into PvP in this game and don't have a great knowledge on the leader boards. If anyone has more details on the leader boards and how ridiculous this criteria may be, I may eliminate this from the criteria as this is a PvE-based game.
4. Completed all missions (this includes OCH as well as any future Danger Missions. OOO said they are making OCH more tradable for everyone rather than just Steam in the future in a patch note).
>>Self explanatory
5. Gained over 9,000 prestige
>>Self explanatory.
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Purchasing the armor after meeting all criteria above.
The armor is purchased from the NPC dual wielding FFs at the core (If someone has her name, that would be nice). It will cost 225,000 crowns each piece of proto armor to buy, and you can only buy the proto armor set based on your starter proto armor explained above. This way, your proto choices will remain unique.
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Prismatic Proto armors.
As reward for the oldest players of Spiral Knights, any player with Groundbreaker Armor has the opportunity to also buy Prismatic Proto armors in addition to their Divine / Volcanic / Shadow proto armors.
If they have both Groundbreaker armor and have met all of the criteria for the Volc / Divine / Shadow Proto armors, then they also get the option to buy Prismatic Proto armors for 725,000 crowns each piece.
Yes, this is also a crown sink. Personally, I do not have Groundbreaker armor, but ever since the accessories / height given to new players for free, I feel that the older players deserve something special.
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Please see this thread on how we also implement the option to change the proto armor we chose incase someone doesn't like what they chose
(personally, the color scheme and type reflects my own decisions and I would never change my own to keep my choices unique)
Succinct, informative, reasonable, and a little sarcastic.
Chocolate icing and sprinkles and you have my vote for president.