
Is there a max area for warpath?
I have 2 points in Zweihander Reichweite, which gives me 70% inc area without shield. I added another 66% from idols, but it seems the area does not increase at all. I tested on training dummy so it’s not only visually.
Then I equiped a shield, which deactivates Zweihander Reichweite, my warpath area is much smaller. I used those idols again, and this time idols do work.
So now I’m confused. How does that happen? What if I put points in Iron Reach? 
How does the new affix that reduces channel cost (sentinel helmet only) work with flat reduction on channel cost?
Assume I have a helmet with t5 reduce channel cost which 30% channel cost (which I haven’t find yet), and another 6 channel cost from Dark Nexus in Warpath skill tree. What would be the final channel cost?
Ideally it would 101030%6=1036=1 (i don’t know if it could reach zero cost or has to be at least 1 per sec)
Or it might be (106)(130%)=2.8.
Which is is the correct formula or both are incorrect?
There is a bug where those Idols only work while you are using a shield. This will be fixed in the next patch.
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For #2 the flat reduction comes off first, then the mana efficiency.
I tried with Ring of Shields (30 base mana cost) & the Tempered Steel node (4 points = 12 mana cost) & 11% mana efficiency on an amulet. If the efficiency comes off first the cost would be (30 / (1.11))  12 = 15.027 which would round up to 16. If the flat cost reduction comes off first, it would be (3012)/1.11 = 16.2 which rounds up to 17, which is the actual mana cost…
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Well that’s sad. I can completely ignore this affix on helmet and focus on void/poison/necro damage taken as physical.