A x1000 Button would be nice. I know that there is a MaxButton now, but I prefer straight numbers for the x4/x10 Bonis. That would be less work than make the numbers straight again after clicking the maxButton.
It builds dark knights. You can view how many dark knights you have gained from the altar under Kingdom Overview or in the options menu. You must RESET for the dark knights to officially add to your kingdom resource gain. ~Taiga
Glad you're enjoying the game! If you press "G" on the keyboard, it will advance you through the levels. =)