Princes of the Apocalypse: Avatar the Last Airbender Edition

Optional Rules:

PHB 165: Feats
XGE 77: Rate of Falling/Flying and Falling. As PotA will, at minimum, have air elementals, it seemed worth expanding the base falling rules.
XGE 77: Sleep. This expands the rules for waking someone up, sleeping in armor, and going without sleep.
XGE 78: Adamantine Weapons. I don't really know why we'd care, but why not.
XGE 78: Tying Knots. Why knot?
XGE 78: Tool Proficiencies. As I am yet to see a situation where we've cared about having a tool proficiency, and I certainly wouldn't take one over a skill proficiency, there will be benefits to trying something for which you have both a relevant skill and tool.
XGE 85: Identifying a spell. Allows you to as an action or reaction identify a spell previously cast, or as a reaction identify a spell being cast. NOTE: Since both this and Counterspell use your reaction, you don't have time to figure out what spell is being cast before you counter it!
TCE 24-78: The default assumption is that we are using all optional class features from Tasha's.
TCE 83: Group Patrons. Most importantly, the Group Assistance rule: once per long rest, each party member can grant another advantage on a d20 test.
TCE: Feats and spells from Tasha's are available.

House Rules:

The Lucky feat is modified thusly: If you use it while you have disadvantage, roll two dice and choose one.

The Lucky feat is replaced with the UA One D&D version of the feat, available here.

The Sentinel feat will be nerfed so you can't poke a dragon with a spear and automatically, with no save or check, reduce its speed to 0. I haven't decided on specifics but keep this in mind if you want to take it.

A player may have 2 Inspiration banked, if they get one of them from their adventure hook.

Inspiration may be spent as a reroll, rather than to grant advantage. It may also be spent to grant advantage, if prefered.

The DELAY action is re-introduced.

• When your turn would start, you may choose to Delay. As each entity's turn ends going forward, you may choose to re-insert yourself in the initiative order at that spot (Undelay), which permanently becomes your initiative number. If you never Undelay before your old initiative comes up again, it's your turn again and you skipped a turn, hope you're satisfied.
• Any negative persistent effects, anything that has something bad happen at the start or end of your turn, happens at the point that you choose to delay. It may then happen again when you actually take your turn. You probably shouldn't Delay while standing inside a Storm Sphere.
• Any negative effects that say "you may save at the end of your turn to end" don't let you save until you actually take your turn.
• Buffs that last until the beginning or end of your next turn expire at the moment you Delay
• The DM has the right to declare that an effect isn't going off yet again if he feels like it has enough in a short period of time already, or things like that

We are using the monster harvesting rules from Hamund's Harvesting Handbook. In essence, when you kill something that has bits that might be useful in alchemy or magical crafting, you might be able to figure out how to properly harvest, preserve, and possibly prepare it.

Under Consideration:

There may be some mechanical advantages to owning a Stronghold, this is still under development. As is the stronghold.