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.
|Specials Lv 3 Plus IV||Aux Core||9.8%|
|Physical Defense Up IV||Aux Core||7.0%|
|Block Rate Up IV||Aux Core||8.4%|
|Aggro Boost IV||Aux Core||8.4%|
|Common Core Crystal||Core Crystal||20.0%|
|Rare Core Crystal||Core Crystal||13.0%|
|Legendary Core Crystal||Core Crystal||3.9%|
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.