Hardcore

Hardcore mode is a Game Mode that can be chosen when creating a new character. There is no way to change a character from one game mode to another after creation. Hardcore characters are deleted upon Death and also have several penalties that apply while playing:

Hitpoints do not passively regenerate
The Bank is limited to a max of 80 slots (The bank only has 12 slots at the beginning of the game, just like normal, but no more than 80 total can be acquired)
The Combat Triangle penalties for using the combat style that is weak against the current enemy are increased.