Build Description
Okay, so instead of me making several builds I'm going to put them all here.
Toggle all but one character off.
These builds might not get you through the entire Raining Goblins challenge with just 100s in stats, but it will enable you to farm for armour with 50s in stats.
For apprentice, you have to figure out what to build first. I recommend a combination of fire-ball towers and Magic missle towers to start.