The feet hurter. This affects the knight. When it stands on a square next to a particular knight (friendly or opposing), it "hurts" the knight's feet and the knight will only be able to move one square diagonally for the rest of the game (since it can no longer "jump" as far). Can only affect a particular knight once per game, but can be performed on multiple knights throughout the game.
I believe this is called caltrops and IMO this is brilliant.
Nuke.
Moves like a king. Cannot check.
If it is captured the entire board explodes and results in a draw (if they're still alive).
Witness my horrible art.
Just what we need, a way to make chess even more drawish.
The rain-maker. Once attacked, it forms "rain" on the chessboard making the squares "slippery". As a result, the movements of all the remaining pieces "doubles". For example, if a pawn tries to move forward one square, it ends up moving two squares ahead. Good for larger chess boards.
And very bad for smaller ones since all knights turn to stags, all bishops to Alfilriders, all rooks to Dababbariders, all queens to alibabariders, etc. Effectively it would end up making every piece four times as colorbound as it already is, turning the game into four different games. 2-3 of which are of course completely irrelevant because they're out of phase with both kings.
The Go piece.
Cannot move or capture normally.
Can be placed anywhere that does not have pieces as a move.
Can only be removed from the board by being surrounded on all four sides by enemies, or if all contiguous friendly pieces are surrounded on all four sides by enemies. Other pieces can be removed this way too.
The Bob cannot move or capture. If opponent doesn't capture within 15 moves owner wins the game
pawn that can only take backwards
bread piece: can't move and revives a piece of the capturer's choice when taken
Nuke.
Moves like a king. Cannot check.
If it is captured the entire board explodes and results in a draw (if they're still alive).
Witness my horrible art.