User blog comment:BannedLagiacrus/Discussion of the Week: 5th Gen Quest Invaders/@comment-26421638-20191011204418/@comment-26421638-20191012083235

For what i know Rajang can be encountered in every single area (Forest, Wildspire, Highlands, Vale, Recess and Hoarfrost) but I don't know if appears during other quests as invader.