Quote from UnclePine;1284045:
What's the radius of a normal dungeon room? Does a r1 Rain Casting's cloud (600 radius) cover all of it?
R1 Rain Casting does cover most of a normal dungeon room, although in normal dungeon rooms, you wouldn't need Rain Casting to run.
Peaca abyss is a completely different story. You'd need radius reforge for that.
Quote from spirit2roam;1284041:
After experiencing Kunai Storm Range gloves, it got me wondering if it's worth investing into ninja and making a Kunai Storm Range lv 17+ glove considering I have a lot of other things such as archery, puppetry, gunner (not viable yet), and even final hit duration + cool down.
Also if I did invest into ninja, how necessary is an attack speed set?
Kunai Storm is the only single worth reforge out of Ninja as I see it. There could be Shuriken Max Damage update later on, but that's another story. Also, note that range can go on other things as well, such as clothes.
That being said, because of the utility heavy reforges, you'd need high base damage. To give you an idea, I have rank 1 all Ninja skills, and at the end of usual Archery talent rebirth, I sit at high 700s with Demi Lich Girgashiy Anju's, well over 800 when I rebirth in Culinary Artist or Close Combat. To compare that with my other max, 840ish max with Bhafel Combo, 920-70 with CRKs depending on talent, even though I won't fall behind much in max compared to my Bow, I still don't have Ninja reforges. I personally feel I'd need more max with Ninja to actually be satisfied with it compared with other classes so for now it's on me to raise Will, but Ninja is basically a STR grind for me.
I'm not saying you have to be at a point where you hit 1k max with Shurikens, but I'd say you generally want mid 800 or high 800 to start doing things. If you're not at a point where your gunner isn't "viable yet" and also not much Fighter ranked, I'd assume you want stats from those first.
As for the attack speed set question, my personal take is that it's not necessary but always a plus. Looking at how dependent Ninja is on Kunai Storm, there will only be few occasions where you'd be using normal attacks. One situation that I can think on top of my head is Shuriken Charge -> Kunai Storm -> pew -> Shuriken Charge.