Unnatural Vitality & Under Zero HP Effects (All)

[Zyraen]

Following is the Unnatural Vitality trait for Revenants, as Reference, and not a House Rule.

Unnatural Vitality: When you drop to 0 hit points or fewer and are subjected to the dying condition, you can choose to be dazed, instead of falling unconscious. You make death saving throws as normal, and if you fail one, you fall unconscious instead of being dazed.

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Clarification
a) If you fail a single Death Saving Throw during an Encounter, you cannot benefit from Unnatural Vitality until you Rest.
b) Whenever you drop to 0 HP or fewer, you can choose to fall unconscious instead of remaining Dazed.
c) This also means that IF you do not take any HP damage, you cannot choose to fall unconscious.
d) However, at the End of your Turn you can choose to fall unconscious. This is due to being subject to dying condition" (see below).

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Superior Will: You gain a +2 feat bonus to Will. This bonus increases to +3 at 11th level and +4 at 21st level.
In addition, if you are dazed or stunned, you can make a saving throw at the start of your turn to end that effect, even if the effect doesn’t normally end on a save.

Interaction with Unnatural Vitality
Based on what is written, once you pass your Superior Will save, you are no longer dazed until you take damage again.
However, House Rule as follows : If you pass your Superior Will save at the Start of your Turn, and at the end of your turn you have less than 0 HP and hence are subject to the dying condition, you become Dazed again at the End of your Turn.

This prevents Revenants who are Defenders from enforcing their Marks properly through the use of Immediate Actions and Opportunity Attacks, etc.

[Zyraen]

There are many powers and items that use the term "drop to 0 Hitpoints" or variances thereof.

This is technically a House Rule, though common sense would have the same meaning, and that is "drop to 0 Hitpoints" is treated as the same as "drop to 0 hitpoints or fewer".

[Zyraen]

Here are two items that arguably make Revenants unkillable, and so are listed and handled.

Death Brink's Armor Property
While you’re dying, you don’t die until you fail four death saving throws.

Note: "While you're dying" means while you are at 0 or less HP and are above negative bloodied. If you are at negative bloodied or less, you are no longer dying - you are dead. Hence the armor's property does not stop you from being killed at negative bloodied.

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Soulforged Armor Property
When reduced to 0 hit points or fewer, you remain conscious until the end of your next turn. If you are still at 0 hit points or fewer at that point, you fall unconscious (or die) as normal.

Note: The armor implies that even if you are reduced to negative bloodied HP, you do not die unless you fulfill the condition to die at the end of your next turn. Which frankly makes characters wearing the armor unkillable and hence invulnerable unless they can be denied healing.

Hence the following House Rule:
If you are reduced to negative bloodied or less at any point, you cannot regain Hitpoints, and will eventually die.
(yes, there is no duration given, so it stays in effect literally until you die)

In the case of Soulforged Armor, this will cause you to die at the end of your Turn. This also interacts with some other Epic Destinies like Legendary General to make them less broken.

[Zyraen]

Most effects and powers that trigger when "You are reduced to 0 or fewer Hitpoints" and other synonyms like "drops you below 1 Hit point" are Encounter Powers or Dailies, hence are reasonable.

However, there are some feats, features and possibly powers that arguably do not obey the above, such as:

Iron Wolf Warrior
Level 10 Feature (10th level): When an enemy drops you below 1 hit point, you can make a basic attack against that enemy as a free action immediately before you begin dying.

Stormhawk's Vengeance
Benefit: If an enemy reduces you to 0 or fewer hit points with an attack, it takes 10 thunder damage. This damage increases to 20 at 11th level and 30 at 21st level.

As written, both the above effects would continuously be triggered by damage dealt to a Revenant at under 0 HP, who would keep dealing 20-30 thunder damage and make a basic attack each time he is hit. However, this is arguable for Iron Wolf due to "before you begin dying".

There may be other feats, items, powers etc that I am not aware of.

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Hence following House Rule:
If any feat, power, feature, etc refers to "reduced to 0 or fewer Hitpoints" (including synonyms) and can be used more than once during an Encounter, the "to" is treated to mean as "from above 0 hitpoints to"
So these would only apply when "reduced from above 0 hitpoints to 0 or fewer hitpoints".

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As a separate note, a similar rule applies to most Enemies that can recharge abilities or take special Free Actions when Bloodied, and that is "when first Bloodied". They get the much shorter end of the stick.

[Zyraen]

RETIRED as the party is no longer in Athas as Undead

This isn't really a "House Rule", but just to clarify.

HP Losses in Athas (for Sat Night group)
As mentioned, you use defiling to manifest your powers and items.

At Will Power: 5 HP
1-10 Encounter Power: 10 HP
11-20 Encounter Power: 15 HP
21-30 Encounter Power: 20 HP

Second Wind does not cost any HP, nor does normal Movement (not powers)
Encounter Powers include Utility Powers. Daily Powers cost twice that of Encounter Powers.
Any Augmented Powers are treated as Encounter Powers of their respective level.
Item Daily Powers are treated as Daily Powers of the same level as the Item.

The Damage taken cannot be reduced or resisted in any way. It can be deducted from THP.
If the Power is a healing power or any power that regains HP, the damage is taken after the healing is resolved.

You can drain HP from any willing Ally within Burst 10, or any Unconscious Ally within Burst 10.
You also can drain HP from Creatures that are much lower level than you, and they cannot resist your Defiling.
These are treated as Minions, and will die when you use defiling on them.

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With Trailblazer, more Feats and Items are available, and most Stat requirements have been removed. Retraining into any such new options can be done "for free".

As mentioned, you can freely retrain any Feats for purpose of better utilizing Unnatural Vitality. Note that you are Not a Revenant and do not qualify for Revenant Feats.
You can swap up to one item as well, please let me know, as the swap will be permanent, applying even after you leave Athas.