This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A fortified place or a fortress.

n. A place of survival or refuge: one of the last strongholds of an age-old tradition.

n. An area dominated or occupied by a special group or distinguished by a special quality: a feminist stronghold; a stronghold of democracy.

n. A fortress

n. A place of refuge, survival or domination by a particular group or idea

n. A fastness; a fort or fortress; fortfield place; a place of security.

n. A fastness; a fort; a fortified place; a place or position of security: often used figuratively, and formerly as two words.

n. a strongly fortified defensive structure

"But my biggest problem was with a stupid group of European holy men levitating inside some sacred Asian mountain stronghold, wearing what looked like cheap Buddhist robe knock-offs."

defense    defence    defensive structure   

fortification    refuge   

redoubt    citadel    dungeon    hold    blockhouse    bastion    donjon    keep   

fastness    hold   

fortress    fortification    citadel    bastion    castle    outpost    territory    chieftain    monastery    fastness