BBB = burn baby burn
FtF = fuel the fire
Both those skills increase the chance that Krieg self inflames when/after setting an enemy on fire by whatever means ( krieg takes damage while on fire and can even die from it, but his Hellborn skill tree skills tend to provide extra bonuses while Krieg is on fire so it can be a worthwhile tradeoff )
Chance to self ignite after igniting enemies =
0.07 * BBB Rank (+ BBB skill from COMs works) + 0.07 * FtF Rank (+ FtF skill from COMs DOES NOT APPLY - BUG - UI LIES)
Fuel the Fire is bugged. Extra +Fuel the Fire skill from COMs DOES NOT increase krieg’s chance to self inflame despite the UI (falsely) claiming otherwise
So it can reach 100 % chance to self inflame with 10/5 BBB (+5 BBB from COM) and 5/5 FtF . ( 0.07 * 10 + 0.07 * 5 = 1.05)
// Roll to set target on fire
# Chance to trigger effect 1.0000 * 30.0000 * 1.0000 * 1.1377 * 0.6000 * 1.0000 * 1.0000 * 1.0000 * 1.0000 * 1.0000 = 0.2048
// SELF INGNITION CHECK ( 0.07 * 10 + 0.07 * 5 = 1.05)
# Dice Roll: 0.76561 vs 1.05000
# Damage Type = FIRE ; ElementalMul = 1.00000; ( GrenadeMul = 1.14080 ); address = 3E973818
# vsShieldMul 0.40; Intermediary Damage Value 0.50000000
// IF chance to self ignite succeeds - A roll to apply fire DOT on self is faked/forced ( F4 = 1k)
# Chance to trigger effect 1.0000 * 15.0000 * 1.0000 * 1000.0000 * 1.0000 * 1.0000 * 1.0000 * 1.0000 * 1.0000 * 1.0000 = 150.0000
I only tested legendary torch so far. I will take a look at other COMs that boost fuel the fire to see if they work …
EDIT:
BUG CONFIRMED (twitchy reaper COM +5 FtF test):
# Chance to trigger effect 1.0000 * 30.0000 * 1.0000 * 1.1377 * 0.6000 * 1.0000 * 1.0000 * 1.0000 * 1.0000 * 1.0000 = 0.2048
# Dice Roll: 0.01943 vs 0.70000 ( 5/5 + 10/5) ( 0.07 * 5 + 0.07 *5 = 0.7)
# Damage Type = FIRE ; ElementalMul = 1.00000; ( GrenadeMul = 1.14080 ); address = 3E973818
# vsShieldMul 0.40; Intermediary Damage Value 0.50000000
# Chance to trigger effect 1.0000 * 15.0000 * 1.0000 * 1000.0000 * 1.0000 * 1.0000 * 1.0000 * 1.0000 * 1.0000 * 1.0000 = 150.0000
For Fuel the fire skill only the chance to self ignite doesn’t benefit from the COMs , the extra chance apply elemental effects on kills works. Notice F9 =5 in the combat log output bellow. (100 % + 400 % = 500% ) at 10/5 fuel the fire fuel the fire provides 400% extra chance to apply elemental effects for a short while after a kill…
# Chance to trigger effect 1.0000 * 30.0000 * 1.0000 * 1.1377 * 0.6000 * 0.9000 * 1.0000 * 1.0000 * 5.0000 * 1.0000 = 0.9215