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A Princeps commands his Titan through the [[Imperial_Bionics#MIU|MIU link]] to the Titan's "spirit," controlling the Titan's movements through his thoughts. The Titan becomes an extension of him; when damaged, he feels pain, ; when victorious, he feels elation. This link grows so strong that his mental health will slowly deteriorate when unlinked. Because of the immense power of a Titan's spirit, the Princeps must also possess the strongest of wills to survive such a link. He can assume direct control of any system, though it is usually aiming and fire control that is taken. Regardless, Titans must have both Princeps and crew to function. The Princeps' relation to the Titan is similar to that of a Space Marine within a Dreadnought, ; however Titans eventually form their own minds from centuries of experience. The link in some cases gets so strong that the Princeps becomes physically-integrated into the Titan, and cannot be removed until he dies.