The Sentinel is a black staff resembling a wrought-iron fence post. It has a small iron spike at its base and a slight widening of the shaft near the head. The head consists of two main sections, separated by a diamond-shaped piece with two small protrusions. The bottom section resembles a tiny cage, with several thin bars separating from the shaft and curving around to converge in a spherical formation. The top section is an iron diamond with three short, rod-like protrusions on the upper three corners, giving it the vague appearance of a cross. Four small spikes are present on the edges of the diamond, and a round yellow eye with a slitted pupil is set into the center.
While this staff offers relatively low Magic Attack boosts, it greatly increases Natalie's Accuracy and provides above average Evade bonus. Additionally, it may further boost Natalie's accuracy by activating its Unleash, and resists all accuracy-reducing debuffs. It also protects her from two Status Effects: Syphon and Death, which comes useful as Syphon prevents Natalie from using the magical abilities that she relies upon.