basically im trying to upgrade my weapon and armor but which 1 is better
weapon:-Leviathan Blade
or
-Cold Iron Vanquisher
equipment:- vog cub set
or
-Skolver set
second weapon: guns or bomb (lv 5 weapon name)
Levi - Useful for everything in this game
CIV - Useful if you like graveyards and FSC or if you are having a lot of trouble with Undeads
Skolver - Useful if you do JK a lot, if you hate getting stuck at one place and not being able to move or turn or if you enter Slime and Beast strata a lot
Vog Cub - Useful if you do Vanaduke a lot, if you hate getting burned to death, if you have the Troika line and the Sealed Sword line or if you enter Construct and Gremlin strata a lot
Leviatan /Cold iron vanquisher - i would chose cold iron vanquisher cuz it has only slight diference in the attack between those swords and CIV have undead bonus. Still i dislike both of 'em .
as for skolver and vog cub. If you want attack speed increase go for the vog cub. If you want sword damage bonus go for the skolver.
as for a second weapon i would of chose Dark briar barrage bomb ( the 5* snroblax bomb) , the polaris ( the 5* pulsar) or the argent peacemaker (the 5* antigua)
Levi vs CIV has been debated ad nauseum:
http://forums.spiralknights.com/en/node/2616
http://forums.spiralknights.com/en/node/7314
http://forums.spiralknights.com/en/node/10480
http://forums.spiralknights.com/en/node/14249
http://forums.spiralknights.com/en/node/15119
... there are more.
If you prefer looks over damage or only plan on doing FSC in T3 go with CIV, otherwise Levi.
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Vog is more defensive, Skolver is more offensive. Generally people choose Vog because being quick and having good defenses makes play easier. Both are fine choices though, it depends on the player to make a choice of what fits their play style. You might also consider a mixed set.
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If you only carry two weapons then you are going to eventually need a gun for FSC. Any gun at all will do but Argent Peacemaker is the gun of choice for FSC... unfortunately it is only really useful for zombies.
If you decide to get three weapons, a bomb would be an excellent choice. Shivermist is very popular since it can trivialize many difficult battles. Ash of Agni can decimate arenas and danger rooms, I try not to enter one without it (useless in a fire arena though).