Terrain Defence

Terrain Defence
[Passive] Reduces damage taken from environment by (value)%.
Element	Water
Category	Field
Equips on	Armour
Max Combined	75%
Sell Price	500 G (Rank I)

Terrain Defence (Japanese: 地形防御, Chikei Bōgyo) is a Gem in Xenoblade Chronicles that reduces damage taken from hazardous environments, including poisonous swamps, hot lava, and pools of ether. Such terrain normally inflicts damage equal to 20% of a character's maximum HP at regular intervals, usually every two seconds. Physical or Ether Defence do not reduce damage from hazardous terrain.

Gem stats

	Hazardous Terrain Dmg Reduction
Rank I	2-10%
Rank II	12-20%
Rank III	22-30%
Rank IV	32-40%
Rank V	42-50%
Rank VI	60-75%

Gem sources

Ways to obtain Terrain Defence gems, including completing Quests, trading with NPCs, and completing categories in the Collectopaedia.

Rank I	None
Rank II	Collectopaedia Galahad Fortress - Insect category complete Quest Ingredients For A Brew Trade Zazadan (Satorl Marsh, 1*)
Rank III	Trade Zazadan (Satorl Marsh, 3*) Talia (Satorl Marsh, 3*)
Rank IV	Quest A Dauntless Trader Trade Zel Argentis (Satorl Marsh, 4*) Talia (Satorl Marsh, 4*)
Rank V	Trade Zel Argentis (Satorl Marsh, 5*)
Rank VI	None

Crystal and cylinder sources

Places to mine for Terrain Defence crystals, and enemies which drop Terrain Defence Crystals and Cylinders.

Rank I Rank I	Enemies Mechon M32 M32 Scout Unit Mechon M32X Mechon M31
Rank II Rank II	Mining Satorl Marsh (map) - In a waterfall SSE of Zaldania Waterfall and N of Poison Swamp Enemy Poison Brog
Rank III Rank III	Mining Valak Mountain Upper Level (map) - N of Bionis' Right Elbow Enemies Tempestuous Edegia Chloro Laia Shadow Vang Teneb Vang Buio Vang
Rank IV Rank IV	Mining Central Factory GF (map) - N of Control Tower Enemies M35 Prototype M37/ZEBRA Pandora Pod
Rank V Rank V	Enemies Sacred Zagamei Fiume Nebula Carbon Tude

Unique armour and weapons

Unique Armour and Weapons with Terrain Defence gems permanently attached to them.

Rank I	None
Rank II	Armour Pine Headgear
Rank III	None
Rank IV	None
Rank V	None
Rank VI	None