Path of Exile

Arc isn't a projectile, it has a special property that makes it able to use Chain on though(it says Chaining in the tooltip, the tooltips are very accurate in their categories generally so you can easily find what works or not).

Another rule about these is a projectile can only pierce, fork or chain at once. Priority is Pierce > Fork > Chain so if a projectiles has both pierce and fork, it'll pierce and not fork. If you use a pierce support which is a chance to pierce, it will fork when it doesn't proc pierce. Then if you have Fork+Chain, the first hit will fork but the 2 newly created projectiles don't fork anymore so they can now chain.

Freezing Pulse pierces 100% of the time since it goes through mobs, so that means Fork and Chain do nothing on it. Ice Spear pierces in the first form so you can never fork or chain off that, but in the 2nd form(when it has 600%crit and stops going through mobs) you can fork or chain. However it forks/chains in the first form again and need to travel the set distance before it goes into 2nd form, so you can't like aoe 600%crit shit.

Typical combos are:
Spark+Fork, Arc+Chain, Freezing Pulse+LMP/GMP(lesser/greater multiple projectiles), Icespear+LMP/GMP, Fireball+LMP/GMP/Chain, Firestorm+Concentrated effect and/or increased aoe and/or increased duration(bit of a special one), Ethereal Knives+Fork/Chain and that's about it for spells commonly used. Archer stuff is mostly chain on everything.

Oh and an interesting property of projectiles, the distance they travel is based on time, not on a numerical value(besides Ice spear form change). What that means is using Faster Projectiles will increase the distance a projectile travels before it disapears. This is especially useful for short range projectiles like Freezing Pulse and Ethereal Knives to increase their range. Freezing Pulse will also increase the range at which it does max dmg when doing so I believe, not 100% sure though.

The crit nodes do affect spells unless stated specifically for weapons. Similar to Doom Cast only working on spells, general crit% works on everything. Crit% on weapons only work if it's Global Crit%, if it's just Crit% it's crit with that weapon(daggers have global crit as an innate).

Caliane:

There's a lot of issues with the build though, one of the main one is you shouldn't build for 111points, current max lvl is about 80-85 and you get at most 16points from quests so you shouldn't aim for more than that. The AoE node in the witch area only affects aoe spells, Freezing Pulse and Arc aren't AoEs however. You also take a bunch of 5% points there when you can take 8 and 10% at the start of the witch tree under the cast speed%. Increased status durations aren't that great but you could leave them if you want, I don't know. You want to drop some of the ES nodes and get health nodes if you're not going to go CI. 6% ES nodes especially are shitty, and the cooldown reduction on ES is only good for CI builds.

Think something like this based on your build:
http://www.pathofexile.com/passive-s...epWm0kPKdcSVE=

The amount of % you get is really not worth it for the curses. Get an increased aoe support for the curses or just don't, once you get to lvl 10-12+ in curses, they hit a large enough area. You get +5% radius per level of the gem so even without anything it's fine, besides the early game but that's not worth investing points in I don't think.

The problem with CI and why it's going to get nerfed for sure is if you take CI, you need like way less points than another build with no CI because you don't have to take any health nodes and you don't have to take nearly as many ES nodes to get the same or higher "health" pool. Taking CI doesn't make you into a super tank, but for ranged chars who don't get hit often anyway, doubling or tripling your EHP while taking LESS skill points is pretty much a no brainer. The problem is you get a lot of ES on gear alone, and then CI gives you 50% more. And that's 50% of your total ES more, it's not 50% increased ES like the rest of the nodes which only increase the base and stack additively with each other. That takes your entire ES from your gear, your ES% node and your discipline aura, then add 50% to that. You can get 8k ES as CI without any ES% nodes, none at all. If you take the nodes and have really good gear, you can have up to 12-14k ES. Even with the best gear in the game and ONLY taking health/str nodes and sacrificing your chest armor 6L for a Kaom(unique with no socket that gives 1k health), you're still not gonna reach that amount.

All they need to do is maybe boost a few ES% nodes(like the ones in the middle, make them 8% for the last 2-3points of each line) then remove the 50%more ES on CI and it'd be balanced. And you'd still take it because it's a net gain to be immune to chaos dmg and not have to take any of the health nodes because it takes less nodes to get the CI stuff/they're in better positions.