Level 91 Incinerate Chieftain^3.17

Notes

All skills need lifetap.
Whichever item has aspect of the spider - do not place any supports that would affect mana reservation.
Cast speed is very important for this to feel good.
AoE is also important if possible.

59% of physical damage from hits taken as Fire (only 20% phys as fire for DoTs)
15% of physical damage from hits taken as Cold (essence mod on body armour)
Can get more physical taken as fire from watcher's eye, helmet mod or influence body armour mod.

100% of lightning damage from hits taken as Fire (tempered by war + talisman) (78% lightning as fire for DoTs)
70% of cold damage from hits taken as Fire (including DoTs)

For body armour can go with non-influence with big life, armour, resistances and then use Exarch and Eater of Worlds currency to add +2% max fire res and increased effect of purity of fire implicits.
This way easier to reach 90% max fire res. Or use Megalomaniac unique jewel, but they can be hard to find.

Talisman may not even be needed if you are still capping cold/lightning resistances.