Blocks

The ender pad is a way to warp on the horizontal axis. The arrow will face away from the player when placed, and if you sneak while standing on top it will send you to another ender pad in the direction the arrow points, up to 20 blocks. It will send you through walls so it is a great way to move in and out of an area that may not have a normal access.

The player plate is a pressure plate that will only activate when players are on top.

On its own, the spawner frame is a simple block; however, when a mob net with a captured mob is right clicked onto the frame it will transform into a vanilla spawner of that type of mob. This is a one way process and the spawner will not revert back to a frame.