Infernal

Can see in dim light within 60 feet as if it were bright light, and in darkness as if it were dim light.

+2 racial bonus on saving throws against fire and poison effects.

Cast darkness at will (Caster-Level = 1/2 Heritage Level) and cause fear, scorching ray, *or unholy blight*1/day. Add unholy aura +3 to will saving throws.

+2 trait bonus to any good subtypes.

You can see perfectly in darkness of any kind, even that created by a deeper darkness spell. Gain a +6 racial bonus to checks Perception vs. those fighting nearby in total and/or dim light, provided they are not also using See in Darkness

Once per combat per round, as a bonus action you as the infernal subtype may activate this on either yourself or any allies within a 15ft radius who share at least one skill with proficiency. The activation of this advantage gives a bonus of +2 on attack rolls, and if scoring a 'hit' adds a +2 damage bonus with the granted proficiency's active weapon, attack or other skill proficiency where hitting grants a damage bonus on scoring 'hits'. At the start of their turn, on any partymember's initiative count using an available or unused action for all party members with the Infernal Heritage subtype present if they have had one or both their turns happen within at least one turn of at least party's own initiate order who has either been affected by their Infernal Legacy may expend any type action to grant a target within 1/2 their own speed a +2 bonus on any save required by the activated individual. This bonus may be used before their first attack roll or immediately prior making a required Save for that round, and immediately ceases after use.

Within and around terrain in both 2D and 3D space that would impose additional movement penalties and/or reduce ability to see normally the infernal gets a +2 on any skill checks to avoid these affects. For effects requiring saves the infernal also adds +2 on these saves. They are considered "warmed" and do not take additional stamina damage and/or other penalties to movement like exhaustion that affect those from hot, arid, firey terrains as per relevant rules per emulated edition

You may take damage without being harmed, and may shrug off attacks by particularly weak foes entirely, though especially powerful blows still injure you. Add damage reduction to your Armor Class against attacks from creatures that are not of a particular kind or alignment, possibly against all attacks that aren't magic. Alternatively, damage reduction only affects some amount of hit point damage each time you take damage and is not always a consistent total.

You gain one bonus language, chosen from those permitted by GM amongst the known Infernal subtypes in the relevant universe those using Infernal heritage originate

Those with fire alignment as well as Fire heritage gain a +4 damage bonus on spells that deal fire damage, provided that the target is either a humanoid or other targets that otherwise bleed. This bonus is in addition to any other relevant trait, feats, or abilities from specific class proficiencies that otherwise double or triple fire based ability damage