Although their actual scheme to locate the Pit and unleash Krakoa's most dangerous mutants will fail as a result of those mutants already escaping, there's a secondary motive in their scheme.

Source: https://www.cbr.com/x-men-bishop-war-college-krakoa-blightswell-marvel/

An X-Men icon is losing the faith of the next generation of Marvel's mutant heroes, planting the seeds for chaos in Krakoa's future.

Source: https://www.cbr.com/x-men-bishop-war-college-next-generation-mutants-marvel/