Terrain Defence

Terrain Defence 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
	2-10%
	12-20%
	22-30%
	32-40%
	42-50%
	60-75%

Gem sources

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

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

Crystal and cylinder sources

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

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

Unique armour and weapons

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

	None
	Armour Pine Headgear
	None
	None
	None
	None