To use RSS, you can use the 2 methods: Nuke or Snipe. Snipe is just standing far from enemies and spam the bomb. Careful, might hit switches/aggro distant enemies like gunpups. Against gunpups, try to use a gun, but RSS can pick off gunpups AND interrupt them, but if multiple are attacking you gunning is the way to go.

Nuke is, quite literally, moving in, placing the bomb, and watch the carnage as it detonates much like a nuke dropping and then exploding dealing huge (collateral) damage. Basically this tactic is less safe but tends to deal more damage, especially to undead and perhaps the freakish fiends. Against enemies with lunging attacks (zombie swipes, jelly tackles, wolver bites etc), simply trick the enemy into attacking you, place the bomb in front of them, run sideways (DO NOT shield bump) and watch them walk right into the bomb and have the shards blow up in them. Deals huge damage, especially to zombies. Unless you want to MAINLY bomb, I highly suggest NOT getting it. Unless you use it for lockdown which is a different case.

Mist bombs, are pretty much like siren said. If I might add, freeze might not be useful if the enemies are not interrupted by your DA as their attack will continue but freeze locks them in place, subjecting you to damage. I highly suggest shiver in conjunction with the charge. Voltaic is more or less a better support, while spasming enemies not only get damage, but most(?) of their attacks are cancelled, and can let you combo with DA more effectively. Ash of Agni helps you kill stuff faster + helps party (UNLESS THERE ARE OILERS, they are perhaps the MOST ANNOYING enemy, especially when set on fire), though if you solo there's almost no point in getting one.

Vortex require skill in placing them. For one charging them slows you down heavily, thus you need to watch your step. Second, you should try to remember spawn points of enemies and place the vortex there before stepping on a party button (if any). Third electron vortex is better than graviton, as the shock chance is rather high(?) and keeps them in place instead of blowing them away like Graviton do, allowing you to continue your beating.

As siren said- if you DO want to go into bombing, get a nitronome first, it'll be your best friend when bombing.

It does piercing though. Remember to specify, we ARE helping someone right? =o

My favorite combo of 4 for no specific level (general use) is

solo: Nitronome + VT + Ash + RSS (I personally don't use Shiver solo since this game isn't difficult enough on random clockworks levels to really need it. Use Nitro as a nuke, its knockback will help keep stuff off of you. VT / Ash if you need to kite stuff / blanket the area with mist before a button. RSS for turrets / jello cubes / zombs / retrodes etc with forward swipes).

group: Electron Vortex + Shiver + VT + either Dark Briar or Dark Ret (Wether or not you take Electron depends on who is in your group: It's nice if you have someone shoot some kind of attack / projectile that literally pierces enemies or does more damage on clustered monsters. Not graviton since electron can shock and maybe not spit out enemies after the explosion. Shiver and VT as status bombs to help your group out. DBB / DR for DPS without knockback).

Those two are what I have been having fun with, but I don't know much on bombs since I am still learning. I heard Electron + RSS gets you a ton of DPS in FSC on zombs, but is dangerous to do. Any advice on what I might want to change would be awesome.