Edit your launcher link and add the "developer" word behind the executable (without quotes). Developer mode will be unlocked and you can use from the top right. E.g. "K" will do 100 strength damage to all enemies. You can also use the console to unlock more possiblities.

Code	Effect
saga item_all	Will add all items;beware, doing in battle will grab your time.
saga market_refresh	Will refresh the market items.
saga market_show	Will open a market anywhere.
saga roster_add x	Where x = a hero name; this may cause game script problems, use with caution. No removal!
spawnadd	Adds an enemy to the battlefield