Activating this trainer:
If not state otherwise below, press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.

Promo Options:
NumPad6: Freeze Mission Timer

Trainer Options:
NumPad1: Unlimited Health
NumPad2: Unlimited Stamina
NumPad3: Unlimited Mana
NumPad4: Unlimited Special Karma Skill Meter
NumPad5: Fast Attack Cooldowns
NumPad6: Freeze Mission Timer

Editor Options:
Player Stats: Atrack Speed
Player Stats: Cast Speed
Player Stats: Movement Speed
Player Stats: Max HP
Player Stats: Max Stamina
Player Stats: Stamina Regen
Player Stats: Max Mana
Player Stats: Mana Regen
Player Stats: Damage Multiplier
Player Stats: Melee Defense
Player Stats: Magic Defense
Player Stats: Ghost Mode

Notes:

EDITOR OPTIONS

For Player Stats, Damage Multiplier if set high you can kill things with one hit.  For Ghost Mode, set to 25 or higher and when hit, you don't get moved or knocked back, even though you may take damage.

Unlimited Health:
Toggle on to keep full.

Unlimited Stamina:
Toggle on to keep full.

Unlimited Mana:
Toggle on to keep full.

Unlimited Special Karma Skill Meter:
Toggle on to keep full.

Fast Attack Cooldowns:
Toggle on and many attacks reset instantly.

Freeze Mission Timer:
Toggle on and the mission timer telling how long you've been in the mission remains frozen.