You asked how SQIs work, so I'll try to give you a little overview, not too much detail though.
First off, SQI stands for Super Quest Item. SQIs are mainly designed for WoE / PvP, And some possible PVM use as well. It is the ultimate weapon that your class can have. An SQI cannot be bought off the website, so technically, they can't be donated for (unless you donate like $300, and then sell the Ad Credits). SQIs are very expensive, as you can see. Each SQI has ingredients, and the ingredients vary from Zenny and Items.
When you are ready to make an SQI, you will have to do a few things. First is to collect all the ingredients and have the ammount of zenny required. After that, you must collect a set of Seals. Those are: Seal 1, Seal 2, Seal 3, and Seal 4. You then need a party of 6 (including yourself), and they also need to have all 4 seals. Once you have the party, you go to a place in Yuno, where there is an Arena. You then have to kill 10 MVPs under a specific ammount of time. The MVPs are (not in specific order) Tao Gunka, Dark Lord, Evil Snake Lord, Mistress, Doppelganger, Baphomet, Mini Baphomet Jr MVPs, Turtle General and Stormy Knight. Once you do all that, you are then warped to a location called Valhalla, where there are NPCs which allow you to make your SQI.
Remember, 1 character can only make 1 weapon SQI, and two accessory SQIs. Sleipnir [1] can be made multiple times (unless thats changed in recent updates). Also, each character is limited to their SQI weapon. For instance, a Champion cannot make an Evangelist (which is the Priest's SQI), only the Suiken.
Now, each class has their own Super Quest Item, and they vary.
They are the following:
Sniper/Hunter: Artemis Bow [3]
Assassin/Assassin Cross: Twin Fang [3]
Alchemist/Biochemist: Djinn [2]
Blacksmith/Whitesmith: Mjolnir [3]
Dancer/Gypsy: Belmont Whip [3]
Clown/Bard: Electric Guitar [3]
Monk/Champion: Suiken [3]
Priest/High Priest: Evangelist [3]
Rogue/Stalker: Sherwood Bow [3]
Knight/Lord Knight: Nibelungen [3]
Crusader/Paladin: Aegis SHIELD [1]
Sage/Professor: Tome of Ymir [3]
Wizard/High Wizard: Staff of Magi [3]
Gunslinger: Vesper Optics [1] (mid Headgear).
Other types of SQIs that are wearable by any class are:
Sleipnir (non slotted), Sleipnir [1], Valkyrie's Helm [1], Meginjorde & Brysingamen [1].
For a more detailed look on the SQI, what they look like, their ingredients and such, check out this thread:
http://www.anthemro.com/forums/index.php/topic,83.0.html--------------
That should be a decent explanation for now; if you want more, just PM me in forums and I'll explain/answer your questions.
