Mo Wen did not know much about Fighting Spirit Towers. He only knew they were the places that Immortal Cultivation world sects used to cultivate their disciples. The Divine Pill Sect that he had belonged to in the past had had a Fighting Spirit Tower too. At that time, a disciple like Mo Wen did not have the qualifications to enter the Fighting Spirit Tower and thus learn from experience inside the tower.
Based on what Mo Wen knew, only large sects had the capabilities to construct Fighting Spirit Towers: normal immortal cultivator sects did not. Also, Fighting Spirit Towers were ranked. The more powerful the Fighting Spirit Tower, the larger the benefits it brought to the immortal cultivators.
However, even the lowest ranked Fighting Spirit Tower was something that was hard to find. Rumor had it that back then, in order to construct a Fighting Spirit Tower, the Divine Pill Sect had dedicated a millennium worth of the sect's accumulated resources.