Im a lvl 80 hybrid int s/s nuker, and i suggest s/s because it pwns.
First of all, i have a really good build so u pwn at 80 and 90, however its gona be a pain and with 90 a few months away (december-january time) as the best guesses go...its up to you to do this.
At 80 i have:
80bicheon
80lightning
80fire
60ice
and heres why:
Bicheon:
using a shield will save your life countless times, blocking an attack that could ahve been an 8k mars is amazing.
The skills your going to need to use are the chains, kd, stabs, ironwall, and possibly the smashing series (up to you because it offeres a status debuff in the last book)
Chains are mainly good in PvM, not generally PvP until your last chain...lightning chain. Using lightning chain will cast division, bleed, and impotent randomly, which will pwn your enemy. Kds, for obvious reasons will save your life, and not only that, but doing a kd and 3 stabs to an enemy is more dmg than straight nuking by far, with some good crits itll be amazing. Ironwall will make u invincible to all phy damage for 15 seconds because it will most likely DOUBLE your phy def...Also, it is fun BUT NOT NECESSARY to have blade force series (where u throw your blade) and the very last skill tree (again throwing your sword) its nice to ahve them to plvl, and or agro mobs to you quickly, but dont expect damage out of them.
Lightning:
Lightning is a must for all int based characters because of the magic damage buff, the lightning nukes which pwn at grinding and at job wars where u can hit multiple people, and lionshout which is essential for effective grinding. Moving speed is also a great benefit, and the parry ratio buff and passive will help to minimize your damage taken so u survive even longer. In all, the entire lightning tree is a MUST for ints (even the imbue at lvl 90, which ill discuss in the 90 section)
Fire:
At lvl 80, fire is a possible use, but will be likely dropped at 90

. Fire offers you massive damage with the nukes and imbue, and status immunity, and mag defense, plus phy damage buff which will help your damage when u crit/hit with bicheon skils.
Cold:
I leave cold at lvl 60 because IMO the mroe damage from fire at 80 is better. Lvl 60 cold is its biggest boost so far in stats, so ice from lvl 1-59 is out of the picture, its a waste of sp and mastery skills to have it anything below. Lvl 60 allows a nice def buff from the passive and cold armor, and the ice shield will do a 40% absorbtion, which is more than enough atm.
At 90, i suggest, for now:
90bicheon
90light
90ice
30fire/heuk
Bicheon:
because as i said before, bicheon is your main 1v1 pvp tree with kds, and it only gets more pwnage with 5 stabs at lvl 90
Lightning:
again as i said befor,e essential to any int based character because everything in it is 100% beneficial and it will now be your main imbue.
Ice:
at lvl 90 ice def boost and snow shield are extremely powerful, and therefore is totally worth maxing out. You will now use lightning and cold nukes for grinding, which is more than adequate for noob mobs. However, in pvp, dont expect too much from your ice nukes, i suggest u stick with lightning nukes and bicheon skills for that.
Fire:
U can chose lvl 30 fire for some status immunity, small mag def buff, some phy damage, and the nuke isnt even worth mentioning at lvl 30. Not suggested but its your call since anything lvl 30 isnt gona shine..
Heuksal:
u can choose lvl 30 heuksal just for the hp bonus, plus it might be fun to pull out a spear and kill some nubbies every once in a while =)
Pacheon?
just thought, maybe the AR from pacheon bird and passive will help out a bit, but i think id choose the 3XX hp over a few more AR, idk yet.
sorry, i kinda went fast and there may be some typos
