Does Unarmored Defense stack with a staff of power and the Bladesong class feature?

I’m playing a level 10 blade singer wizard with one level into barbarian for unarmored defense. I have a +5 Dex modifier, a +5 Int modifier, and a +4 Con modifier. I also have a staff of power that gives +2 to AC.

My total AC would be 4+5+10=19 from Unarmored Defense, +2 from the staff of power, and +5 from the Blade Singer arcane tradition, for a total of 19+2+5= 26 AC. Is my math correct?

How does a Cloak of Displacement interact with a tortle’s Shell Defense?

The cloak has a property that causes creatures to have disadvantage on attack rolls against the one wearing it, and

This property is suppressed while you are incapacitated, restrained, or otherwise unable to move (DMG, pg 158).

The way Shell Defense is described

You can withdraw into your shell as an action… While in your shell, you are prone, your speed is 0 and can’t increase, you have disadvantage on Dexterity saving throws, you can’t take reactions, and the only action you can take is a bonus action to emerge from your shell (EGW, pg 181).

is effectively the same as being both incapacitated and restrained, with the only notable difference being that an attack against a prone creature

has advantage if the attacker is within 5 feet of the creature. Otherwise, the attack roll has disadvantage (PHB, pg 292).

While extremely similar mechanically, the tortle using Shell Defense is technically neither restrained nor incapacitated. Furthermore, the ability to emerge from its shell as a bonus action implies the capacity to then move during that turn if the tortle chooses to, so neither are they otherwise unable to move.

As such, would the Cloak of Displacement work for a tortle using Shell Defense (and thus cancel out the advantage melee attackers would normally have due to the prone condition)?

RAW and RAI interpretations are both desired.

Path of War Defense conundrum?

Path of War has Strike, Boost, Counter, and Stance.

Strike – usually an attack and extra damage and some effects

Boost – extra damage usually

Counter – repost, dodge, reaction

Stance – at will mods to certain aspects of combat

So my friend and I got in to a bit of a debate. Some Strikes and Boost can catch a target Flat-Footed. But if said target has a Counter,…can they counter the Strike/Boost while Flat-Footed? Specially if they don’t have Uncanny Dodge?

What features, items, or spells allow dodging as a bonus action other than Monk’s Patient Defense?

I’m looking for features, spells, or items that trigger Dwarven Fortitude without the use of Ki points.

Dwarven Fortitude:

Whenever you take the Dodge action in combat, you can spend one Hit Die to heal yourself. Roll the die, add your Constitution modifier, and regain a number of hit points equal to the total (minimum of 1).

The feat requires performing the Dodge action. As such, Sword of the Paruns, Blur, Foresight, or any other thing that gives the benefits of the Dodge action would not trigger the feat, as far as I’m aware.

Dealing with defense in BESM

In BESM, it seems to be a lot easier to build a character capable of dealing massive amounts of damage than a character capable of taking massive amounts of damage. As a DM, I don’t want to build every possible opponent with massive armor and defense attributes, because it feels unrealistic that everyone walks around in power armor or whatever. What am I meant to be doing to help balance combat? Or is this not meant to be an issue?

The game I’m running is fairly low on combat, mostly social interaction, but when a PC can one-shot just about anyone with a 26-point weapon, they’re getting a little cocky. It’s themed around high-school aged characters, like one of those shows that alternates between slice-of-life filler episodes and battles with season-long reoccurring villains. A lot of their fights are the result of social interaction going badly rather than storming the castle, so I’m not always sure in advance who they’ll pick a fight with.

(We’re in 3rd edition Tri-stat, not d20)

Unarmored Defense (Barbarian plus sorcerer plus monk) [duplicate]

If there is a level 3 Draconic Bloodline Sorcerer, with a level in Barbarian for Unarmored Defense, and another level in Monk, for a 5th level character in total, would their total AC be 13 + CON + DEX + WIS? What if this character was also a warforged, with +1 to AC, +2 to Constitution, and +1 to Intelligence, Strength, or Dexterity?

Could a 5th level character do that in the first place? If so, does Unarmored Defense stack in that way?

Do objects (like doors) start with a base Defense of 10?

When Damaging Objects, considered to be Defenseless:

Inanimate objects are defenseless by definition and therefore subject to finishing attacks (see the Finishing Attack maneuver): essentially, you can choose between making your attack on the object as a routine check or, if you make the attack check normally, gaining an automatic critical hit if your attack hits, for a +5 bonus to effect.

This is all fine and good, except that the last time I had to adjudicate this, with someone trying to kick a door down, they objected to me starting with the Base 10 defense for the door, namely they chose to Power Attack, and where already damage shifted, and completely missed the door. I can kind of see their point that a door shouldn’t be that easy to miss hitting. I think I described it as more of a "glancing blow", that they were trying so hard to hit it hard that the blow just skidded off of it. But the question does remain, should a Defenseless object the size of a door start with a defense of 10 such that the average bystander has a little more than a 50/50 chance of actually hitting it if they’re trying to hit it hard? Am I reading the rules wrong? Did the player maybe just get a little too greedy in trying to do more damage?