Press CTRL + SHIFT + ~ during game play to display the console window. Then, activate the following cheats by entering the corresponding codes. Note: The highest level is 199. Also, cheats cannot be enabled under the Hardcore difficulty setting:

CHEAT FUNCTION - CHEAT CODE
+10 levels - god
Decrease indicated number of levels - descend <number>
Increase indicated number of levels - ascend <number>
Level up - levelup
Restore health - heal
500,000 gold - gold
Spawn indicated item or monster1 - <name>
Display what levels in Druantia and Typhon the Hero Items are on - heroitems
Give indicated quest giver a new quest - request <quest giver name>
Return to town - amnesia
Gain experience - experience
+1,000 fame - fame

1. Enter the name of an item, for example legendary frostrind, to spawn it