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:
NumPad3: Drop Item Multiplier

Trainer Options:
NumPad1: Set Minimum Resources
NumPad2: Fast Contruction
NumPad3: Drop Item Multiplier
NumPad4: Instant Cooldowns
NumPad5: Change Party Gold
NumPad6: Change Ability Points
NumPad7: Change Attribute Points
NumPad8: Change Current XP
NumPad9: Unlimited Focus
Multiply: God Mode (Units Only)
Add: One Hit Kills (Units Only)

Editor Options:
Resources: Wood
Resources: Stone
Resources: Iron Bar
Resources: Food
Resources: Arya Potion, Black Ash Powder, Blessed Lenya
Resources: Iron
Resources: Lenya Package, Arya Cask, Black Ash, Echo, Charchoal
Resources: Moonsilver Bar
Party: Gold
Party: Current XP
Party: Ability Points
Party: Attribute Points

Notes:

EDITOR OPTIONS

Toggle on and the values will fill in.  Edit values then press TAB to lock them in.  In some cases, the game resets values to normal value every so often.

Set Minimum Resources:
While active your resources will not fall under a specific minimum value which can be customized after trainer activation.

Fast Contruction:
While active you construct instantly. Only works for the player.

Drop Item Multiplier:
Toggle on and when you drop items the amount you drop is the value shown in the trainer.  You can modify this value.

Instant Cooldowns:
Toggle on and many cooldowns in the game reset instantly.

Change Party Gold:
First select a hero and move around a bit. Then press hotkey or use editor to change the gold. You will not see your gold ingame has changed until you pick up some gold.

Change Ability Points:
First single select the party member you want to add points to. Next move the party member somewhere by right clicking on the ground. Wait a bit and open ability screen and press hotkey. Now either save and reload the game or spend some points to see it has changed.

Change Attribute Points:
First single select the party member you want to add points to. Next move the party member somewhere by right clicking on the ground. Wait a bit and open ability screen and press hotkey. Now either save and reload the game or spend some points to see it has changed.

Change Current XP:
First single select the party member you want to add points to. Next move the party member somewhere by right clicking on the ground. Wait a bit and press hotkey to change XP. Your XP bar at the top will not reflect this change from the trainer and gets only updated when you receive XP ingame.

Unlimited Focus:
While active you have unlimited focus when using an ability, although your focus bar may visually decrease a bit.