Corrosive Spit is a 
Action. Dilophosaurus use this ability to spit acid at enemies.
Description
Spray a target with corrosive fluids that slowly melt away its Armour Class.
The target's Armour Class decreases by 1 per turn, to a maximum penalty of -5. Water removes the spit and its effects.
Properties
- Cost:
-
Action - Damage:
-
2d8 (2~16) 
Acid damage - + 1d8 (1~8) Acid damage
- Details:
-
Attack roll -
Range: 18 m / 60 ft
Condition: Corrosive Spit
Duration: Until Long rest
- Takes 1d10Acid damage per turn.
- Affected entity's
Armour Class has been reduced by 1. The spit will keep eating away at its defences, further reducing its Armour Class, unless it is washed away with water.
After 5 turns:
- Affected entity's Armour Class has been reduced by 5. The spit can be removed with water.
How to learn
(Information not yet added.)