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Runaway Train Bool is a Unique Monster in Xenoblade Chronicles 2. He is a Garlus Driver enemy who can be found at level 55 in Temperantia, on the ramp to the west of the Ardainian Garrison, facing his troop of Garluses. He must be defeated in order to unlock Zenobia's level 4 "Wind Mastery" Field Skill and Perun's level 5 Cold Sever Blade Special. He is fought as a level 108 Challenge Battle Enemy during Humanoid Alliance.

Bool's Blade

Bool drives a Female Electric Common Blade with a Chroma Katana. Although Bool does not use the weapon in battle, the Blade can still use Blade Arts and Specials.


Name Type Rarity Rate
Specials Lv 3 Plus IV Aux Core Rare (rarity 2) 9.8%
Physical Defense Up IV Aux Core Rare (rarity 2) 7.0%
Block Rate Up IV Aux Core Rare (rarity 2) 8.4%
Aggro Boost IV Aux Core Rare (rarity 2) 8.4%
Ceramic Belt Accessory Rare (rarity 2) 7.2%
Ceramic Belt Accessory Legendary (rarity 3) 4.8%
Common Core Crystal Core Crystal Common (rarity 1) 20.0%
Rare Core Crystal Core Crystal Rare (rarity 2) 13.0%
Legendary Core Crystal Core Crystal Legendary (rarity 3) 3.9%

Challenge Battle

Runaway Train Bool is a Challenge Battle Driver Enemy found at level 108 during Wave 6 of Humanoid Alliance, a Challenge Battle, available as downloadable content from the Challenge Battle Mode Pack of the Expansion Pass. This enemy drops no items.