Otto Bill is the piece of the zone I machine building puzzle that this game kind of gives you the keys keys to the tears of the kingdom with. It makes it something that you can actually integrate into basically every other pillar of the game whether it's like making a hoverbike, fire shooting drone or just three fucking spring stacked on top of each other. You also find templates for other machines that are like sort of pre-built in the game and then you can either utilize nearby pieces to just instantly build that schematic or you can spend one of the resources in the game called zonite which lets you make things from thin air.