What You Need
The Game Board
You will need 4 of the interlocking Base Tiles to form the 10x10 board:
Terrain Pieces
You can't have Fall Damage if you don't have something to push your enemies off of!
Ideally you will want a few of the larger pieces as a foundation, the 3x3x3 mountain cube and/or castle. Then a couple of each of the smaller mountain pieces and buildings.
Lastly you will want some of the environmental terrain like trees, bridges, Lava & Water, and of course lots of treasure chests to incentivize units moving to points of interest.
Miniatures or Similar Unit Representation
The rules
Character Cards & Tracking
Dice
Two six-sided dice (alternatively. Google 2d6, or use The Unit Tracker)