When do player characters leave turn-based action (i.e. initiative order) if they are in a hostile area?

In most circumstances, it is easy to determine when turn based combat ends:

  • One side is completely killed, unconscious or has fled
  • All parties declared truce

But when in a hostile area, like a Dungeon, do you end turn based action after each chamber with an encounter or do you stay in it for the whole crawl?

This is relevant because there are various effects in the game where you gain a bonus each time you roll initiative or depending on whether an enemy already acted.

As an example:

When you are in a dungeon or building completely filled with enemies and the PCs just cleared a room from enemies, but they don’t know whether there are enemies in the next room and if there are whether they have noticed the sounds of battle.

Do you keep them in round based action, because maybe the door opens and enemies enter? Or do you leave it and possible give away that there is no nearby danger or have to reroll initiative when enemies enter the room (and give them the corresponding bonuses).

What is the point of origin for a square area of effect?

The spellcasting rules for areas of effect state:

A spell’s description specifies its area of effect, which typically has one of five different shapes: cone, cube, cylinder, line, or sphere. Every area of effect has a point of origin, a location from which the spell’s energy erupts. The rules for each shape specify how you position its point of origin. Typically, a point of origin is a point in space, but some spells have an area whose origin is a creature or an object.

A spell’s effect expands in straight lines from the point of origin. If no unblocked straight line extends from the point of origin to a location within the area of effect, that location isn’t included in the spell’s area. To block one of these imaginary lines, an obstruction must provide total cover.

Notably, square is not one of the shapes defined, yet there exist several spells which have a square area of effect, such as entangle or Evard’s black tentacles.

The spell grease tells us in its description:

Slick grease covers the ground in a 10-foot square centered on a point within range.

But this clarification is not present in the descriptions of entangle and Evard’s black tentacles.

So what is the point of origin of a square area of effect when it is not specified in the spell description?

Can I use area of effect targetting rules to Entangle a target 105 feet away from me?

Entangle is a spell with a range of 90 feet. But, the wording of it…

Grasping weeds and vines sprout from the ground in a 20-foot square starting from a point within range.

Can I orient the square so it points directly away from me, covering a 20×20 space which can encompass a creature which is 105 feet away from me?

Does the Distant Spell Metamagic double the range of area of effect spells that have a range of self?

The Distant Spell Metamagic option gives you the ability to double the Range of a spell, or give a spell with range of Touch a range of 30ft.

If I would apply this to, let’s say, burning hands, which states as Range Self (15ft cone), would this increase the cone size to 30ft or would this cast the spell up to 30ft in front of you, with a 15ft cone still?

Other example, aganazzar’s scorcher has a Range of 30ft, and the description states:

A line of roaring flame 30 feet long and 5 feet wide emanates from you in a direction you choose.

Now to me, this implies the same thing as burning hands, but the Range does not contain Self.

RAW I would allow the second case to increase the AoE effect if it is cast with Distant Spell, but not the first, since it is of Range self. But obviously this does not make any sense, so which one is the correct interpretation?

Stone Shape: can the stone extend past the original affected area?

The spell Stone Shape allows the caster to reshape a stone object or section of stone:

You touch a stone object of Medium size or smaller or a section of stone no more than 5 feet in any dimension and form it into any shape that suits your purpose.

Can the reshaped stone extends past the original affected area?

For example, would it be possible to raise a stone pillar from the ground using this spell, or extend a stone wall into a ramp?

The 5e Inquisitive Subclass allows perception checks as a bonus action. Would that matter in a heavily obscured area during combat?

Let’s say an Inquisitive is in a fog cloud. By my understanding, advantage and disadvantage cancels out if you are fighting someone else in that cloud. But if you were able to make a bonus perception check (and succeed) before attacking, could that negate your disadvantage?

As far as I can tell, there are no direct rule applications but I just wondered if someone had any thoughts on it. I guess in my head, using your action to search for someone when you can’t see due to environmental conditions them isn’t that useful for attacking purposes. But if you were to use a bonus action (in effect searching and attacking near simultaneously) would that change anything?

Same question for attacking from outside said hazard. I search, find, and shoot arrow – negate disadvantage?

Can Mask of the Wild allow you to basically ‘disappear’ in front of your opponent if in a light foliage area? [duplicate]

Hiding on P177 PHB states

You can’t hide from a creature that can see you clearly.

Then Mask of the Wild PHB P24 indicates

You can attempt to hide even when you are only lightly obscured by foliage, heavy rain, falling snow, mist, and other natural phenomena.

So, can a wild elf in melee combat with a creature in a wooded area with light bushes around them simply take a move action, move 5 feet in a light foliage square, then use his action to hide right in plain sight of his opponent (5 feet away)? Then complete his movement using the cover of the light foliage to escape ?

I am looking for the RAW ruling on this no interpretations must be traced back to specific words in official written rules or official WotC rule clarifications

Does Evards Black Tentacles affect the 5 foot cubes above its area?

So I’m playing in a tomb of annihilation game and there were some succubi that we were fighting. We had information ahead of time that a lot of them were grouped up together talking to someone and so I decided it would be a good time to whip out my new spell Evard’s Black Tentacles. Now the problem is that the Dm said that the creatures are flying creatures and are unaffected.

My problem is this, when the spell designates that the 20 foot square area is the area of the spell, does that actually mean hostile enemies have to be physically touching the ground or does the spell reasonably affect the 5 foot cubes that the 20 foot square has above them.

Does moving a grappled foe through someone’s threatened area trigger an attack of opportunity?

If one has grappled a foe, and then succeeds on a check to maintain it, one of the options is:

You can move both yourself and your target up to half your speed. At the end of your movement, you can place your target in any square adjacent to you. If you attempt to place your foe in a hazardous location, such as in a wall of fire or over a pit, the target receives a free attempt to break your grapple with a +4 bonus.

The attack of opportunity (AoO) rules state that:

Moving out of a threatened square usually provokes attacks of opportunity from threatening opponents. There are two common methods of avoiding such an attack—the 5-foot step and the withdraw action.

  1. Does being moved out of a threatened square by someone else (in general, or while grappled) triggers an AoO?
  2. If it does, would that trigger the "if you attempt to to place your foe in a hazardous location" clause?