When you turn to sage you can get the skill named Hindsight. That allow you to cast low level bolts at a 25% trigger chance with each melee hit.
The sage link allows you to cast lvl 10 bolts instead of lvl1~4.
If you're playing on a private server, you most likely have a stat and skill resetter, if it's a official one, you stat as I said earlier, and your skills would be firebolt, colt bolt, Frost diver and lightning bolt.
The bolts are the main focus of the hindsight build. You need to learn all the bolts you want to use with hindsight so you need firebolt and the others.
Another fun thing is that you can do a multi element attack on your enemy. Mostly you can only manage two or three, but if you get instant cast and 190 aspd you can actually attack with 4 elements at the same time.
Mostly you can use(if in pvp), water element on your melee and hindsighting firebolt, or the opposite. So there are many different ways of using the talents. When you hit Scholar you will be able to cast duble bolts, which also work with hindsight. It's an incredible skill and the power is just insane.
A nice combo that I discovered worked really well with a hindsight sage, was the Garm+Garm Baby combo. It's Garm on armor(if you manage to get the card), and garm baby(which has 5% to cast frost diver on your enemy).
With this combo you have a chance to cast frost diver at a 30% trigger rate on each melee, that procs alongside with the hindsight which triggers at a 25% rate. So you can use this together and unleash the most powerful attack combo ever.
By using this you cast water element and lightning element at the same time, without casting anything, making your lighting bolts do duble damage if they procs right after the frost diver. At the same time you can cast fire bolt, making your elements a whooping 3 at the same time. Then you think about that you would be using a Book of apocalypse you attack with 4 elements at the same time(you can slot this book to [2], allowing your garm combo).
That is the easiest way of attacking with 4 elements, but if you play on a mid rate or whatever, and can get 190 aspd and instant cast you can attack with 5 elements at the same time, but that means you have to change your bolt usage a bit and it requires alot of perfect timing.
I used to play scholar and sages alot before haha, don't hesitate to ask about anything.