After passing through the main portal, one first reaches the tower basement, which also serves as an entrance hall and provides access to the organ gallery above via two staircases. To the north of the tower adjoins the nave, which, starting from the organ, is flanked on the left and right by a stone gallery. On the north wall of the eastern gallery hangs a sculpture of Christ nailed to a cross, created by the Erfurt artist Hans Walter in 1952. It is intended to commemorate the destruction of the church by bombs and its reconstruction despite difficult conditions.Pohl, K. (2002). Unser Christus. Brochure for the Christus parish in Erfurt (in German). Cited from: "Das von Hans Walther 1952 für die Thomaskirche geschaffene Triumphkreuz." In: Stadt und Geschichte, No. 15, 2/2002, p. 15. One of the most precious treasures of St Thomas' Church is a three-winged retable from 1445, wide and high, which stands on the altar. It belongs to the ensemble of four valuable Erfurt carved altars and was probably donated between 1440 and 1448 by the Archbishop of Mainz, Dietrich Schenk von Erbach. In the centre of the retable, the Coronation of Mary by Christ is depicted, and in the upper row to the right of it, the encounter of St Thomas with Christ. Since a restoration, the wings are movable again; they are closed during the Passion weeks to reveal the backs which show scenes from the Passion of Christ. To the left of the altar on the east wall is a sacrament house from 1440, donated by Hans Heilwig in memory of his wife Künne von Milwitz, and to the right on the west wall is a relief of St Thomas the Apostle from 1440, showing St Thomas and his coat of arms, a dog with an arm in its mouth.
