Here's some typical DK actions for creatures:
Forge Weapon/Enchant Item/Craft Armor/Cast Permanent Buff/Teach: This is all produce advantage.
Reveal Backstory: This is also produce advantage, and it adds a bonus when that backstory is relevant.
Create Ammo/Prepare Scroll/Buff Ally/Assist Ally: This is all Support.
Attack/Intimidate/Poison/Cast Offensive Spell/Debuff Enemy: This is all inflict disadvantage.
Create Trap: This is either block or inflict disadvantage, delayed for when the trap goes off.
Shield Spell/ Go on Full Defense/ Bodyguard/ Protect Room/ Stealth: This is all a block of some sort, whether it's being seen or being attcked or what not.