For some reason Kats are very hard to hit with this Bomb, nab a Voltaic tempest for them.

For everything else, Hug the enemies' backside and place the bomb in one of the cardinal directions. Doing this, you can get at least 3 hits per blast.

For a long time I ran FSC with full Mad Bomber and two weapons: shiver and RSS. It's very handy on floor 25 when the "doors" block creatures. Here's a tip: charge RSS, wait for a clear moment, step just inside the "door wall" and drop the bomb, step out. It tends to do max damage since everything is crowded right there.

Also handy for after a trojan attacks, put it behind him. I find just off to the side tends to get the trojan with more than directly behind, I'm still working on them.

With zombies in FSC, I find it best to run around in circles right in the middle of the mob. Drop RSS and keep running around them, it hits multiple enemies at once and if you're close, more than one shard can hit each. When dealing with one zombie at a time, stick it right in front of their face, NOT behind. Then as they swipe at you, duck and weave away, and they step over the bomb and take even more shards right in the kisser.

The biggest thing you have to learn is this: DO NOT USE YOUR SHIELD! Shielding bumbs creatures back, which means off your bomb, which means it does less damage. While I do like RSS as a range weapon, especially when solo, it really is best when up close and personal. Which means you really need to get comfortable with running around in circles to make yourself harder to hit.

Also if you're in a group with people who think knockback is the best thing since sliced bread, and they polaris spam, or insist on smacking the zombie closest to you with a DA in order to "protect" you, RSS will be less useful. You might want to use the vortex in those moments.

My greatest fun with RSS has been when someone else was spamming vortex. Stand right smack in the middle of the vortex and unload RSS as quick as possible. Sure, you might die, but hey, what's life for if not risking your neck in FSC? You're a MAD bomber, right?!?

Non FSC wise RSS can be pretty powerful. Good on constructs to a point, I have some fun using them on gremlins and jellies (RSS actually can knockdown gremlins), they are unfortunately mediocre on beasts. And I'm not going to talk about fiends because... this bomb screws up entirely. Maybe not on trolljans since RSS shreds them to pieces easily (and my favourite moment? a trojan dashes and kills me just as I plant down an RSS. While he dashes, the RSS fuse goes off while trojan is on top. I got killed and the trojan died as well. Yey trolling the trolljan). Greavers can be a pain, but with some luck you can ACTUALLY get the bomb to go off while dem greavers are hugging you. Satisfying, but risky. I shall not talk devilites.

In FSC, RSS is a powerful bomb. On zombies, here are a few tactics:

1. Zombies tend to move forward with their swipe. With their current speed on swipe distance fixed, head to zombie front, place one bomb down and back off (don't shield or you'll shield bump the zombie away), and as the zombie moves forward and swipe air it'll usually be hit by at least 5 shards.
2. Zombie leap tends to directly land on you. Take advantage of this! Place a bomb down, back off as the zombie begins to leap and by the time they land they'll most likely be on top of the bomb and get hit by all 8 shards. Beware though, with the new update zombie leaps can hurt you before you move away in time.
3. Sniping zombies can be pretty fun; the shards themselves actually have more range than most gun bullets can reach.

On trojans, wait till they attack, run round, place a bomb, watch it go off and stare at damage numbers. If placed correctly, about 3-4 shards will connect at best.

On vanaduke himself RSS can be pretty powerful especially when multiple shards hit. However, if your party is shiverblitz combo-ing then try not to use RSS; the shards tend to break the freeze too fast especially when you have ctr max.

DBB = Dark Briar Barrage
RSS = Radiant Sun Shards

RSS is a VERY effective bomb, however there are a few situations where I don't like using it.

WOLVERS: obviously DBB is much better, and it knocks them.

GREMLINS: they move to fast/too slow, I normally use DR unless there are menders, which then i'll normally switch to DBB to knockdown.

DEVILITES: Mostly because you cant normally get more than 1 (maybe 2) of the projectiles to hit each devilite. I find DBB or nitro a much better option.

TROJANS(situational): in a group, I normally use RSS, because its easier to plant when they aren't looking. Solo, I normally circle around them, dropping DBB, it normally hits them in the back every time. Takes longer, but much easier and kills stuff around them as well.

MECHAKNIGHTS: Yes, it can be very effective on them, but I normally use VT or AoA to kill them, much easier and I don't have to get close.

SLIMES: Since DR is much better, it's basically useless on anything other than Lichen Colony or bigger slimes.

SPOOKATS: T3 spookats are very hard to hit with RSS, you are better off with a gun/sword sidearm or DBB/VT/AoA.

Now, strategies to use RSS on other types of mobs.

LUMBERS: since they are slow, normally I circle around them, placing RSS as close as possible, and to their front or back. Normally you can get 2-3 each time. If you are lucky, they will lunge at the right time and you can get 4-5 off.

ZOMBIES: By far the best mob for RSS. When they do their claw swipe thing, drop it in front of them and run away. They will move directly onto the square and get hit by 5-8 of the shards. Easily 1 shotting them in most solo situations.

RETRODES: Similar to zombies, wait until they are about to swipe you. Easy damage.

GREAVERS: DBB doesn't interrupt greavers, but RSS does. If you can time the charge well, you can hit them before they attack, and interrupt them. The only problem is its a pain to get them all in one place in some situations.

TURRETS: This includes Polyps, Howlitzers and Gun Puppies. RSS interrupts them, so it is very easy to attack them from afar when not reachable. However I prefer DR on Polyps (2 plants then run away).

LORD VANADUCK(lol): Really good in p1. normally 800+ damage with DB max. After that becomes almost useless unless running a water party. Requires too much coordination and I'm normally just too lazy and I spam Shiver.

Feel free to PM in game with any questions.