Originally Posted by
XghostzX
9-8-7-1
9-1-8-0
9-9-9-9
Pure INT.
You're honestly ok performing any combo, but of course you'll want to begin your combo by using either frostbite or drain because they're 12m skills. There isn't any one good combo because endgame relies heavily on dodge. You'll find that some days a particular combo will work really nicely and other days you'll question why you even play the game. As a result, the best PvPers can recognize their opponents combo and adjust accordingly to counter it – and that requires a lot of anticipation skills, improvisation, and tough judgement. But the more you practice the easier it gets.
The most important thing to focus on for now is hitting the frostbite + fire combo. The better you get at timing it up, the more effective you'll be in PvP. Obviously, it won't always land, but when it does you'll have an advantage over the other player.
You said it, weakness is pretty useless at endgame. Some mages/pallys find it useful. From my personal experience, I've never found it to be beneficial.
If you have any questions, feel free to ask. The more endgame PvPers the merrier.