The Dwarf explained

The Dwarf moves and captures like a King. The Dwarf is not royal and can be attacked and captured.
The Dwarf has as special ability, that it can only be captured if two or more pieces of the opponent are attacking it.

In the below diagram, the white Dwarf is attacked by two black pieces, while the black Dwarf is attacked by only one white piece.

For White, bxc5 is illegal. For Black, ixh3 and Bxh3+ are both legal moves.

This diagram shows how dangerous the Dwarf is. The black King cannot take the white Dwarf, and it is mate.

In this diagram, the Dwarfs are attacking each other. But neither of them can take the other Dwarf, because there is no second piece that helps in the attack. At best, the Dwarfs are blocking each other's path.

The following diagram shows a situation that may be confusing.

Only the Rook on h6 is attacking the Dwarf. The Rook on h7 is not attacking the Dwarf, because the Rook on h7 cannot jump the other Rook. Rh6xh3 is not legal here.

Now there's a Witch on the board, who makes the Rook on h6 transparent for the Rook on h7. Rh7xh3 and Rh6xh3 are both legal moves.

A piece that is pinned on the King can attack a Dwarf. In the following diagram:

Although Nxd4 is not legal due to the pin, the Knight on b3 does attack the Dwarf. Rxd4 is a legal move.

Dwarf and Time Thief

The rules for the Dwarf and the Time Thief come together as follows:
When a Time Thief sees a foe Dwarf on square A, then the Dwarf 'invokes' an attack by the Time Thief on square A when it moves away to square B.
When at least one more piece allied with the Time Thief is also attacking on square A, then a capture of the Dwarf by the Time Thief is possible.
This does not depend on whether or not the Dwarf is attacked on square B.

So in the following position, white to move:

After any Dwarf move by white, Black can capture the Dwarf with the Time Thief.

How much is it worth? must be beastly in endgames.

Much stronger than a Queen.

The best game so far with a Dwarf:

https://www.chess.com/forum/view/chess-variants/bulldog-chess-with-witch-and-dwarf-evert823-bad-dobby-fischer

thanks-I'm new by the way.

I've added a new section to the OP about how and when the Dwarf can be captured by the Time Thief. This scenario has been mentioned by @haoming09.

Ultimately, this is classified as a deathmatch piece; the first I came across for Bulldog.

It's awesome. I like it.

What's a deathmatch piece? And where can I read more about it?

What I meant is that it is a piece that is extremely powerful at the beginning and does more damage than the progression of a typical chess game; closer to the beginning.

Apparently, however, I misused the terminology.

I just wiki'd "deathmatch", and it seems I have ascribed the wrong definition to it. A "deathmatch", according to its official definition, is a game that is meant to bloodily kill your opponents. I thought "deathmatch" meant a faster pace game that is usually easier to finish, achieved by having a strong large enemy (or, in this case, a powerful chess masterial count) at the beginning.

While one usually achieves killing an opponent bloodily more easily with a larger army at the beginning, beginning larger army is not the actual direct definition.

So "deathmatch" is not appropriate. Do you know of a term that means "large army  prowess at the beginning?" That is the kind of piece the Dwarf is.