Umbrism is a branch of terrorism which uses unlawful violence and destruction, usually without a political aim. On most occasions, Umbrism's aims are to put any non-practicers into torture and despair, usually using extreme methods. Those who practice Umbrism are usually those who enjoy the suffering of others, and desire to see every non-Umbrist in despair and torture. The philosophy is mainly practiced by members of the UMBRA Insurgency, in which it originates.
Umbrism was originally founded by Jesavich Kerrien, using his beliefs to drive humanity into torture and despair. His philosophy was spread to likeminded people with similar intentions. All of those who believed in Umbrism united together to form the UMBRA Insurgency, which was close to 10,000 members. The Insurgency became highly militaristic, and used the Umbristic beliefs to keep their goals in mind.