Hellfire Damage (5e Variant Rule)
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Hellfire
Hellfire is a bonus damage rule that comes into effect when you get three 6's when rolling damage dice, though this is not limited to d6 dice rolls. When this happens, the person can roll an extra 6d6+6 damage; though this can only occur if the target is evil or has done evil actions. Creatures that are good or incapable of committing evil acts willingly are unaffected by this bonus damage.
Hellfire damage is considered "True" damage meaning that it can go through any resistances and immunities a creature may have, it can also not be reduced in anyway once the damage is dealt. The appearance of such an effect is under DM discretion
When the Hellfire damage is rolled, if you get another set of triple 6's you may roll another Hellfire damage rolls. The damage this time is applied in additively so 6d6+6 becomes 12d6+12, you roll that and the damage can stack depending on if player is able to get enough triple 6's (Up to a maximum of 6 times).
If an evil character gets a triple 6 rolls when dealing damage, they also may roll bonus damage at the cost of damaging themselves with the subsequent rolls (DM discretion advised)
Alternatively, instead of doing the Hellfire chain in an additive manner, you may opt to use the original variant in which you multiply each subsequent Hellfire chain by 2: 6d6+6 becomes 12d6+12 and it would become 24d6+24 and so on (up to a maximum of 6 times.) Warning: This can produce an extreme amount of dice that would need to be rolled and is only viable with a Dice Bot and instantly annhilate encounters, if the players get lucky.
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