Q1:Is it pronounced Fau-sit or Fau-ost?
Q2:Is the faust line better or the night blade line?I like the faust because of the knockback,high dps and chance of curse.
Q3:What shadow gun is better the umbra driver,Sentenza or the Biohazard?
I farm rjp alot and most of the times alone so thats the thing i have the Mighty Cobalt set with the shield.
1. "Faust" is a single syllable. It's like the English word "fist", except that the vowel sounds like the English word "ow": "fowst". Faust is actually a classic European folktale, in which a man trades his soul to the devil for magical powers. Read Wikipedia to learn more.
2. My opinion on Gran Faust vs. Acheron (and their precursors) is here: http://wiki.spiralknights.com/User:Jdavis/Swords#Shadow_Swords.
3. The three shadow guns have really different play styles. Sentenza, like Argent Peacemaker, is very easy to use, does decent damage, has good range, etc. It's a simple gun, with no surprises, other than that the charge attack is bad (because it immobilizes you for such a long time). Umbra Driver, like Nova Driver, is harder to use, but delivers superior damage in the hands of an expert. Biohazard uses the Catalyzer play style, where you slowly set up charge attacks, and then detonate them with a regular attack. This gun is fun, but it shouldn't really be your first shadow gun. My opinion: If you're focused on having a decent gun in the short term, consider Sentenza. If you want a better gun in the long term, get Umbra Driver.
You should strongly consider switching armors. See the armor section of my sword guide linked above.