I am fairly experienced with the methods/items taken etc, so there's no need to talk about that.

 

However I heard that Supreme and/or Prime had their agressive range increased. But can I still solo rex without the other kings getting me or do I have to tribrid now? I'm not talking about 'sneaking in' but more along the lines of getting attacked while maging/luring rex.

Prime can get you as soon as you take one step out of the safespot.

There range has been increased (the RuneTek upgrade caused it as a side effect).

tbh supreme won't ever get you. Prime however will if you use the old spot or don't wait for him to get out of range.

 

Theres a nice guide with the best spot in AoW (general I think).

http://www.youtube.com/watch?v=uWJJVxNLVig

 

This guide shows a better spot.

Skip to 3.57

TBH that spot/method only works well with a unicorn, if you have guthans with less then a titan you'll need to heal more which involves risking primes range a lot more.

 

That is the best safe spot for general use. Its possible to lure more west and have rex stuck just before that location, without taking any hits if you fast.

 

Never let your hp drop below 70 as prime is evil.