In general, this thread is more about designing a build rather than being a typical "this is how you should play the game" lecture.
As a sidenote: I hate the Chaos Set btw. Did I mention that? Honestly, there's no real specific reason. It's a depressing tarp, soaked in gasoline, with a fine mix of shattered glass, twisted shrapnel, and high explosives duct taped to the inner lining, and dyed a disgusting shade of paste gray, with a touch of the most depressing shade of purple possible. Gameplay wise it's a dark shroud throwing a massive middle finger at the mechanics of the game, touting your complete perfection and flaunting your perceived amazingness... No offense to anyone who uses the set btw! Some of my best friends use the Chaos set so that makes it all OK! Right?
Weapons and Armor
Spiral Knights is a game that stresses offense over defense. However, most people seem to start their builds by picking their armor first. You want your armor to compliment your weapons. Unless you are designing for a specific situation where you want an armor set that provides a certain defense, you should figure out what weapons you want to use first. Do you plan to go pure swords/guns/bombs? Or do you plan to go with a sword focus, and still have a gun? Do you want your gun to deal damage or be there just for utility (pull aggro, knockback enemies, stun/kill turrets, flip switches, etc)? Do you want bombs for crowd control? Or do you want bombs for AOE damage (if not both)?
From there, you have to actually decide on what weapons you want to use. There is a wide collection of guides to suit your Sword, Gun, and Bomb needs. Now here we go into our next category...
Bonuses
The biggest trap players fall into when making a loadout is that they try to maximize ALL THE THINGS! You must get that +6 MAX bonus on EVERYTHING because that's what it means to MAXIMIZE POWER!
Yes yes, good for you, but let's talk a bit about practicality. If you have a weapon like a Flourish, having CTR MAX is completely wasted. If you have a Blitz Needle, having ASI MAX is completely wasted. If you have a bomb, having any ASI whatsoever is wasted. If said bomb is a Shivermist Buster, having any bomb damage bonus would be wasted. You can't/shouldn't just aim for universal blanket bonuses without thinking about your weapons. That's why I think you should start your builds with your weapons, and then get bonuses to compliment said weapons.
The hardest bonus to acquire is, by far, Damage. You can always fall back on UVs to give bonuses to ASI and CTR. However, giving you a flat bonus damage for all situations is difficult. You'll have to incorporate damage into trinkets and your armor (This is one of the reasons why I don't like using Vog). ASI is probably the easiest bonus to get, because of the amazing Swiftstrike Buckler. Admittedly, Sword damage bonus, specifically, is somewhat easier to acquire than most, with the BTS (but really nothing can compare to the vuluptous Swifty<3). CTR is not that bad because every weapon has a natural CTR Med at heat lvl 10, but there aren't that many armor sets that provide CTR, outside of the bomber sets.
I have a general rule of thumb I like to follow: Strive for Mediocrity: High is still quite high.
Believe it or not, a High bonus is still quite a good bonus. You don't need to sacrifice valuable trinkets and armor pieces to acquire a maximum bonus. I usually try to aim for High or VH when getting those universal blanket bonuses, and never more. This lets some random UV's still shine through, and not be wasted. Theoretically, the only UVs you care about are ASI and CTR med or better. Practically speaking, you can get a UV like +dam vs Undead med on an elemental Brandish and be perfectly happy. With only a blanket VH damage bonus from like Skolver/Snarby, the UV can shine through and bump you up to a Max damage bonus vs Undead.
Here's an example build. More specifically, this is my build when I need to bring a Shivermist into FSC. I'm not saying you should copy this build exactly, rather use it as an example of how to build around your weapons:
- Snarbolax Helm (Stun Resist Low)
- Snarbolax Armor (Stun Resist Med)
- Swiftstrike Buckler (Norm def Med)
- Combuster (ASI Med, +dam vs Undead Med)
- Final Flourish (ASI Low, +dam vs Fiend Low)
- Argent Peacemaker (+dam vs Undead Med)
- Shivermist Buster
- Elite Bomb Focus Module (CTR Med)
- Penta-Heart Trinket or Soaking Wetstone Pendant
Just looking at the blanket bonuses, you have Sword +dam VH, ASI High, and Bomb CTR med. Admittedly, it's a bit underwhelming compared to say, the gasoline soaked socks which would provide a universal +dam VH and a unviersal CTR VH. However, it's more about the individual weapons. Also, unlike wearing a pair of TNT coated trousers, Snarbolax Armor has this mythical thing called "defense," more specifically against Shadow Damage which (little known fact) is everywhere in FSC (Feel free to take a moment to recover from the shock of this realization)!
The Combuster has a net ASI Ultra, and a +dam vs Undead Max. I don't charge spam with my Combuster, thus a CTR med from heat lvl 10 is all I need (That's just my playstyle, leftover from back before Brandishes got a buff). The Final Flourish has a net ASI VH, and +dam vs Fiend Ultra, which is what I use to execute Trojans. The Argent Peacemaker has a +dam vs Undead VH and ASI high. I love my AP simply because I just need Swifty and it's good to go. I can rely on it for DPS and for utility (not as good as an Alchemer, but it serves it's purpose to finish off stragglers). Then the Shivermist has CTR VH, and that's all it really needs. Admittedly, the trinket is somewhat wasted on just one weapon, and the Swiftstrike's ASI High is wasted on the Shivermist, so the build is not 100% efficient... but it works pretty well. All of this is also accomplished while still having a free trinket slot that I use for defensive purposes. I could swap this for another offensive trinket... but practically speaking I don't really need it.
If I instead went with the flammable glass armor (and assuming I replaced the Elite Bomb Focus Module with something else), I would have had CTR max on my Shivermist. Yes that is great... however I don't use my Brandish's charge, I don't use my Final Flourish's charge, I don't use my Argent Peacemaker's Charge... So I'm basically sacrificing all my defenses for what? CTR Max and Damage VH on a Shivermist (So much damage man!), and Max damage on my Argent Peacemaker (more specifically, +2 over max against undead).
Random Addendum
If you're going to take away something from my ramblings, please let it at least be this: You don't need Chaos to be efficient with your item builds. One of the reasons I've grown to hate Chaos is that people always assume it's the only choice if you want to maximize efficiency. Nowadays, anyone who asks for equipment advice is almost always told to use Chaos. Chaos has become a lazy copy/paste response. Doesn't matter your equipment, doesn't matter your playstyle, nothing else matters: Just use Chaos and you're good!
Chaos is a situational armor set. It is not just for those who know what to expect or those who are good at the game. If you want a fully optimized build with Chaos armor, you need a build that is designed around spamming the charge attacks of multiple weapon types for damage. Otherwise, you can make builds that DON'T rely on the full Chaos set to achieve your goals (I don't mind mixing Chaos with other armor pieces, because at least the second armor piece can cover the weakness's of Chaos), WITHOUT sacrificing most of your defenses (Don't throw the "UVs on Chaos" argument at me... that is a whole different can of worms). You can even make effective hybrid loadouts without Chaos... It just takes more thought than "Chaos + Swifty."
I uh... TL;DR'd it but I really have to disagree. I bring BKC and/or Chaos to 85% of all the places I go to.