Age of Empires II: Definitive Edition · Siege technology
Siege Engineers
Siege Engineers increases siege weapon range and attack against buildings, with exceptions for range and a larger building-attack bonus for two unit types.
How it works
Siege Engineers is a University technology costing 500 food and 600 wood, with a research time of 45 seconds. Siege weapons gain +1 range except rams and Armored Elephants, and +20% attack against all buildings. Petards and Flaming Camels instead receive +40% attack against buildings. The stated range exception applies to the range increase.
Read the supporting references
Check the edition and source version for patch-specific details. Guide methodology.