Heroes in order of first use: Hero 2 → Hero 1. Pieces that end up somewhere new: all 6 crystals and both mirrors.
Hint 2
Start: move the right top-right mirror down 4 tiles, move the right top-right mirror right 3 tiles and move the right top-right mirror up.
Hint 3
Finish: move the right top-right mirror left 9 tiles, move the right top-right mirror up 2 tiles and move the right top-right mirror right, then head for the exit.