# Tower Ballistae **Entity Type:** Skill ## Properties | Field | Value | |-------|-------| | Category | Military | | Type | Discovery | | Knowledge Cost | 46,000 | ## Description Tower Ballistae is a Military skill that unlocks the Tower Ballistae defensive building. This powerful defensive structure provides enhanced protection for your city by attacking enemies on sight with ballista weaponry. ## Effects Unlocks the following Defensive Building: | Building | Description | |----------|-------------| | Tower Ballistae | Ballistae attack enemies on sight to protect the city | ## Unlock Requirements - **Knowledge Required:** 46,000 - **Prerequisite:** Research Stone Walls This is a Discovery-type skill, which makes up the majority of skills in the Anno 117 skill tree. To research it, you must first reach it via a research path and complete the Stone Walls research. ## Related Skills Other skills in the Military category: - Aegis Research - Aux In, Aux Out - Axe-Bearers - Balearic Ballistics - Perilous Ports - Encampment Errands - Carpe Civitas - Cover positions - Multi-task Menders - Equicurrian Chariots - Featherweight Frames - Sturdy Construction - Plated Hulls - Rammed Earth - Dominion Research - Here Come The Cavalry - Imperial Measures - Camp Campaigning - Cataphractarii - Co-ordinated Volleys - Legatic Research - Legionaries - Legionic Research - Manipular Manouvres - Manor Invictus - Nautical Research - Ordine Research - Parabolics - Parmae - Rain Of Pain - Praetorians - Bargain Palisades - Pro Domo - Provisinal Castra - Vitruvius-class Crossbeams - Repair Cranes - Armousmithing - Shipwright Studies - Shipboard Scorpiones - Protective Entourage - Catapult Carriers - Navarchal Research - Scorpiones - Spathas - Brick By Brick - Another Brick In The Wall - Stone Walls - Slingers - Chariots - Sword and Sald - Tuatha De Danann - Tower Contiguity - Valetudinaria - Cautious Greeting - Tacking - Target Practice ## Source - [anno.land - Tower Ballistae](https://anno.land/en/anno-117-skills/turm-ballisten/)