Cracklecreep Ruby RingRequires Level 8+(20-30)% to Fire Resistance(20–30)% increased Fire Damage (3.1–6) Life Regeneration per second (20–30)% increased Mana Regeneration Rate Ignites you inflict spread to other Enemies that stay within 1.5 metres for 1 secondFear the fire that spreads like a plague.
Ruby RingRequires Level 8+(20-30)% to Fire ResistanceFiery DeathSupport, Spell, AoE, Fire Tier: 2 Cost & Reservation Multiplier: 120%Support Requirements: +5 IntSupports any skill that Hits enemies, causing enemies it Ignites to have a chance to explode on death.Enemies Ignited by Supported Skills have 60% chance to explode on death
Explosion Cast Time:1.00 sec Critical Hit Chance:8.00% Explosion deals base Fire Damage equal to 10% of the Corpse's Maximum Life Explosion radius is 2 metresPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple copies of the same Support Gem socketed at the same time.Fire ExposureSupport, Fire, Duration Tier: 3 Cost & Reservation Multiplier: 120%Support Requirements: +5 StrSupports any skill that Hits enemies, causing it to inflict Fire Exposure when Igniting.Supported Skills inflict Fire Exposure for 8 seconds on Igniting a targetPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple copies of the same Support Gem socketed at the same time.WildfireSupport, AoE, Fire Tier: 2 Cost & Reservation Multiplier: 120%Support Requirements: +5 IntSupports any skill that Hits enemies, SpreadingIgnites it inflicts to nearby enemies after a delay.Ignites inflicted by Supported Skills Spread to other enemies that stay within 1.5 metres for 1 secondPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple copies of the same Support Gem socketed at the same time.
Ruby Ring.
Fiery Death and/or 
Fire Exposure, it will also spread the effect of these supports.
