RF with Doon Cuebiyari

how much hp regen do i need to run rf with inner forcre and devotion (previously Atheticism or smthn like that)? do i even need to go to ranger tree for that hp regen nod? if not then i could boost my dps output from both flame surge and righteous fire even more and increase my mana capacity by doing something like this:

http://www.pathofexile.com/passive-skill-tree/AAAAAgEAxthYYz38xFj2SF8_wQQUIHlo7w4LYXgNvooB3ITZ4uoZLkd-YSEn7dlhvTaE7xLhxPYGDlcNrY107Twt1HyRzs9-J9V678auTP8J9gUtHKe3Pq9sDF9Bh_4KaPJTpfno2L3wH3wOgsdodKIAp1Uo-tpiBLNboOvulKDAZprguJOf30Wdpwg8Be98U1LYJJ2umjs2xRJpgpsfAhccBAdxeYPbTLNVxpeVOlhSU6yYPV-X9PFsNthJGyqN7FUdvjOHA-6pbrXyNZLsOCcvkFUaOMAacYV65mP9RtfaubFCDH0Qf8aexLjV-OvkXyo=

The required amount of life regeneration will obviously depend on your fire resistance. For a simple calculation here, I'm going to assume that

a) you've specced Barbarism for +1% max fire res
b) you run a lvl20 purity of fire for +4% max fire res
c) you use Rise of the Phoenix for +8% max fire res

yielding a total of +13% max fire res, that is a grand total of 88% fire resistance. Moreover, I'll assume you run a (lvl20) Vitality aura which allows you to regenerate 1,65% of your max life per second.

If you spec the Inner Force cluster and the Devotion notable, you end up with 26% increased effect of buffs on you. On the negative side this means that RF burns you for 1,26*90% = 113,4% of your maximum life per second. On the positive side, that 26% is just enough to give you one extra percent of max fire resistance from purity of fire (1,26*4% = 5,04%, which gets rounded down to 5%). Furthermore, the effect of Vitality on you is boosted to 1,26*1,65% = 2,079% of max life regenerated per second. It is my understanding that this gets rounded down to 2%.

Adding all this together, you burn for 113,4% of your max life per second, but you now also have a 89% fire resistance. This means the total burn that gets through is 113,4%*0,11 = 12,474%. Given that Vitality regenerates 2% of your max life per second, this leaves you with 10,74% (of max life) regeneration to be handled by passives. Counting the passives on the tree yields

-Scion start + Shaper = 2,2%
-Quick recovery = 0,8%
-Combat stamina w/ cluster = 1,8%
-Sanctity + templar start = 2,2%
-Arsonist = 1%
-Armour mastery + Warrior's blood + marauder start = 3,1%
-Master of the arena = 1%
-Golem's blood + cluster = 1,6%

for a grand total of 13,7%, excluding Heart of Oak at Ranger start. Thus you're easily able to counter the burn caused by RF without even speccing all nearby regen nodes (although i recommend you still do it).

cool, thank you for explaining :) you were very helpfull. i guess the build i linked will be the one im gonna play then, we will see what will turn out with it, and what will i change during some testing.

Check my sig, I made a guide for the RF Doon Flame Surge build I made last league.

doon + vaal molten shell and rf = 3 link vms that with conc effect hits for like 26k+ per HIT with barely any elemental nodes.

put a scolds bridle on, and enjoy 30k+ damage per HIT.

honestly, doon is very underrated. for pure RF its the second best weapon after catalyst, and its barely worse if you don't need leech and melee damage. and doon is dirt cheap