Here's some optional rules for different types of damage in Novus. I've broken them down into "source material," which is the book and page number if there are already rules for that damage type in the rulebooks, "constant effects," which are always taking place when the damage type is used, and "boon effects," which are special combat boons that can only be purchased with their perspective damage type. Constant Effects and Boon Effects are not necessarily in the original rules.
Fire: Damage that is caused by heat.
Source Material: Eldritch Fire on page 77 of Novus Core Rulebook, Elemental Bolt on page 79 of Novus Core Rulebook
Constant Effects: Fire Damage heals at half the natural healing rate. Although it draws from the same HP pool as all the other types of damage, players should keep up with how much Fire Damage they recieved for purposes of healing. Also, once you are on fire, the fire has a chance of growing worse over time if ignored. This makes it a little different than bleed damage. Note Bleed cannot be used as a boon for fire damage.
Boon Effects: 1 boon point - Ignite. Foe is burning for 1 damage a round through armor. Will escalate to In Flames damage in 10 rounds, -1 round for every 2 rolled over the 10 needed to score this boon. If this boon is taken again and the target is already ignited, -5 rounds to the timer. Foe must spend one whole round patting out the flames or douse themselves in a fire suppressant, such as water, to remove this condition.
2 boon points - In Flames. Foe is burning rapidly burning for 2 damage a round through armor. Will escalate to Ablaze damage in 5 rounds, -1 round for every 2 rolled over the 20 needed to score this boon. If this boon is taken again and the target is already In Flames, -5 rounds to the timer. If this boon is taken and the target is already ignited, target is set to In Flames. Foe removes the In Flames condition the same as Ignite.
3 boon points - Ablaze. Foe is engulfed in burning flames for 4 damage a round through armor. This level of flaming if kept prolonged renders armor and items weakened or destroyed on the target. This level of burning lasts 2d10 rounds before reverting back to In Flames, +1 round for every 2 rolled over the 30 need to score this boon. If this boon is taken again and the target is already Ablaze, the remaining time on the timer is added to the new timer and the target begins taking an additional +2 damage per round. If this boon is taken and the target was already In Flames or Ignited, follow the normal rules for Ablaze. If the target is becomes Ablaze from the growing condition of In Flames, the condition only lasts 1d10 rounds. Once Ablaze wears off and turns back into In Flames, the condition cannot go back to Ablaze without scoring another boon.