Solemn Machine (厳粛の巨兵) is a Shadow in the Persona series.
Solemn Machine appears in World 6 of Magatsu Mandala within the Midnight Channel or in World 5 of Magatsu Mandala as a red, or powerful, shadow. The setup of the status screen caps its display of Solemn Machine's HP at 999 when it really has 5,486 HP. Due to its very low Endurance stat, it will take heavy damage from everything except Fire, which it repels. It also nulls Light and Darkness skills. Due to the Apt Pupil and Sharp Student passive skills, it will have an increased chance of scoring critical hits with Vorpal Blade and the party will not be able to land critical hits easily. After being defeated, it may drop Orichalcum. Selling 4 Orichalcum will unlock the Triumph weapon for the protagonist in the shop.
In Golden, Solemn Machine has no weaknesses. Its only offensive skill is Heaven's Blade, but it makes use of Heat Riser and Power Charge.