http://wiki.spiralknights.com/User:Jdavis/FAQs#How_do_I_get_Orbs_of_Alchemy.3F

Just go on more T2 runs dog. It's fun. And if you don't find them, buy them from the supply depot.

Oh god no don't buy eternal orbs! It's only true for elites and advanced and whatever the 2* are called orbs! D:

I wrote this guide and it talks about it- http://forums.spiralknights.com/en/node/108732

"And I can already hear it- "BUT I NEED ETERNAL ORBS OF-", again, you really don't need that. Even on D27 and D28 alone, you'll be finding a higher ratio of eternal orbs to radiant fire crystals, meaning that like shinning fire crystals, you'll very quickly have over 100 eternal orbs that you can't use. The solution: Disregard shinning fire crystals AND eternal orbs in favor of the one true rarity: Radiant fire crystals."

And I didn't even bother to address the question of 5-star orbs, which are insanely plentiful once you're near the end of the game and don't need them anymore. The bottleneck is 5-star fire crystals, as Fehzor says.

I've been doing RJP and Sewer Stash first depth for Elites and have already got 4 of them along with 2 Advanced ones.

Congratulations, but this doesn't tell us anything, unless you also say how many times you've run the missions. For example, 6 orbs in 10 runs is impressive, while 6 orbs in 1,000 runs is not. That's why actual data are valuable.

So is there a specific Arcade level for Shining FCs and also missions where they are a bit less rare.

See the wiki page "Rarity". They drop heavily on depths 19-26. If you continue to play Tier 3, you will end up with far too many of them. My count is easily into 5 digits now. Go to levels with many treasure boxes --- particularly arenas. See also all of the links that you have already been given.

Also, is Gran Faust better than Acheron for Slimes? As I use swords only on Slimes and use my Black Chaingun on Gremlins.

Why not just use your gun on slimes too? And no, GF is not better than Acheron for slimes. But it is better in some situations, such as when there is a crowd of slimes attacking you and you want to hold them back. This is all covered in my sword guide of course.

Well i just do T3 Treasure vault runs and the mission Beyond the Axis of Evil there you will find alot of Shining Fire Crystals and some eternal orbs and also some elite orbs but mostly on the 2nd depth of the mission and it takes around 15-20 mins to do provided you have the right gear. And yeah Neometal is right first depth of Sewer Stash on Elite since it increases the chances of finding stuff and do all the missions and arcade runs on elite if you can to maximize chance.

I have a question: Should I sell my Sealed Sword to Basil rather than using up my time and money to make a Faust or Avenger? Becoz I basically like fast swords and I think that the Sealed Sowed isn't worth wasting money on...

I would keep it, because maybe you'll want to try Divine Avenger or Gran Faust later. On the other hand, Sealed Sword is not hard to get. So you could sell it now and get another one if you decide later that you want it.

and I'd rather have got an Antigua.

I've said this in countless threads, because antiguas are always attractive to players for some reason, but let me repeat: Antiguas are not really very good guns. They don't do an outstanding amount of damage. They don't offer any statuses (except for poison on the Carbine). They have terrible charge attacks. The worst part is that they are really boring to use. They don't get more interesting over time or reward skill in any way. Get some other gun.

Another question: Is a Silver Key for the Steel Lockbox worth it?

You're basically asking how much you value this object --- in particular, do you value it more than the other players, to whom you could sell it? We can't possibly know that, without having much more information about you. To help you decide for yourself, read the wiki to figure out what's in the Steel Lockbox. Also ask yourself whether you enjoy the act of gambling. If so, then you might enjoy opening the thing.

I wanted to try all types of guns

Yes, you should try all types of weapons, because that is much of the fun in this game. But probably you should try the "good" weapons before the "bad" ones.

I like the idea of disabling Gun Puppies so that their attacks get cancelled.

Then you certainly don't want a piercing gun such as Callahan. Polaris is the obvious choice. But consider also Nova/Storm Driver, which can often kill a gun puppy in one charge shot (once you know how to use the ricochets). Iron Slug charges would be good.

Callahan or Iron Slug?

They have been compared in many threads since the gunner update. Try searching Google. The only difference is damage type, so it boils down to the usual consideration of specialized vs. generalized. The only thing I'll add is: Getting a lot of damage out of Winter Grave is difficult, due to the freeze. So I don't recommend a Callahan/Winter Grave combination (which was my knee-jerk reaction after the gunner update).

But I'll need a Piercing gun in FSC

You don't need a piercing gun for FSC. Vanaduke's body is slightly vulnerable to piercing, but you can definitely kill him with a wide variety of guns.

Is Callahan better than DBB for Wolvers and Fiends?

No. In my opinion, DBB is the fastest weapon for clearing crowds of beasts, and the safest weapon against almost all kinds of fiend, except maybe greavers.

And Is Callahan better at FSC than Blitz?

I haven't run detailed tests, but I doubt it. Maybe someone will remind us of how they compare.

I want to buy 9 Advanced Orbs of Alchemy if anyone sells them cheaper than Supply Dep in bulk orders

I don't follow that market, but I can't imagine why anyone would sell them below cost.

Well you should make a SS buckler regardless of whether you choose to use BTS. If you like swords and use the somewhat traditional idea of swords for damage with guns for pure utility, then BTS is going to be the best thing for you; if you don't then I would recommend either plate shield or omega shell as a starting shield, with swift strike on the side. Grey owlite would be a decent option as well, though I typically used my omega shell more often purely because I played on a wide variety of levels when hunting arenas/danger rooms which do not always have a specific and preferred shield type.

And get voltaic tempest if anything. Mercurial armor is mostly outclassed by mercurial demo and black kat, you already have a pulsar, and catalyzer is a garbage weapon. But only get it if you can afford to somehow give it maxed out charge time reduction. As in, are using some combination of chaos/volcanic bomber armor/trinkets/that sprite perk.

Have you read the Shieldbearer Guide on the wiki? It's not great, but it might help.

The most popular shields (other than BTS and SSB) are probably Grey Owlite, Crest of Almire, Volcanic Plate Shield, Dread Skelly Shield.

But really shields are very situational. You want to match your shield to the threats. For example, fiends and freeze are both pretty nasty. And they show up together in The Gauntlet and in Heart of Ice. Dread Skelly Shield is good for those situations.