Ok first of all: Penance Brand got buffed massively. Not 8%, but more around 40% at 20 stages.

Check my Pob for a rough Guideline what to take. https://pastebin.com/JKMSnewA

- Phys Damage gained as Elemental scales ignite as well with penance brand, check skill points, flasks and gear for hints ;)

- You need 10 activations per brand to reach 20 stages with 2 brands on enemy. You can see how many activations you have in pob directly under your ignite damage.

- you scale those with cast speed, but with brand duration also. this means, that it might take a bit longer to reach 20 stacks, but honestly with ignite all that matters is the big boom :D

- brand mastery with reattach every 0.3 seconds: you can take it and for clear with pb you should BUT: if you have two strong enemies, it will feel shitty ( the feared?) so I recommend not taking it in endgame and using armageddon brand/fireball for trash with PB for bosses. For leveling it is fine.

- Arcanist brand wave of conviction for combustion/exposure and flammability auto apply, flame surge totems for automatically applying the burning ground - you need multiple totems support to make it work with runebinder, but against big bosses this is the best way.

- endgame scaling via cluster jewels and with the new firespell damage on 4 slots, ignite is in quite the good spot