"It largely depends on what materials are available. Starting from the simplest and moving to the most difficult or complex: Mechanical engines that can move things and would power some other devices, water pumps and filters, a telegraph system that will allow fast communication between two buildings set up for it, light without fire via electricity, ice-making cold-making and heating machines, composite alloy/ceramic armor that is lighter and stronger than steel (though I have no idea how it'd interact with blessings), more sophisticated communication devices that can be moved around and will do voices properly instead of just simple codes, weapons of various sorts, computers which will take an entire explanation all on their own, robots which are non-alive mechanical servants that use computers and electricity to run."