[3.0] How to Flicker. Two Handed Weapon Edition!

Well Terminus est would still have sub-par damage, while if you want to get good enough frenzy generation chance you'll need to use passives/gems/gear to increase your crit chance(and the sword has just 5% base crit chance). You could try it though could be fun.

I can't really think of any changes to the tree.

Well depends on your weapon. If you have a high base damage weapon - then probably the % icreased damage will be better than the flat damage. But i'd say test it. Put a gear piece that adds X flat physical and see whats the damage increase (say an iron ring) then instead add an item that gives % damage increase or take 1 passive skill point and see what's the increase> calculate the difference adn you'll have your answer for sure!

Well in the end i'd say level them all ... but the most important in my opinion are - Zana(map crafting, offering maps, and the daily mission), Haku(boots/gloves/helmet crafting), Elreon(rings/amulet crafting, -mana rings for sale), Vorici(color/link crafting and extra fusings each day), Tora(belt crafting), in that order.

The thing is that both armour and leech stacking adress the same thing that at this point is a non-issue in Path of Exile - sustaining hits that don't one-shot you. The way armour works here (link to wiki) leads to one simple truth - it works well agains small hits, that won't kill you anyway (and you easily recover from them via even small amounts of leech), but it does nothing to hits that will one-shot you. At the moment you simply can't stack enough armour for it to be worth the investment (especially when you don't have a shield which is the N1 contributor when it comes to armour). And sadly saying that armour is pretty much useless when it matters is not an exaggeration. On the other hand while acrobatics is RNG based using it has no downside compared to stacking armour - you still survive the same hits but on top of that you have 40% chance to survive a hit that you otherwise wouldn't and of course it's worth mentioning that dodge mitigates not jsut physical damage but elemental and chaos hits as well, and with phase acrobatics you have an defense against spells. As for stacking leech - i'd say try palying with just the leech from blood rage , and then stack some more leech and see if there is any significant difference - i can tell you that there isn't any but first hand experience is always the best way to learn things, in the end you could take splitting strikes and vitality void if you feel the need for that and if you feel that it actually helps you out.