The Covenant appears as two interlocked rings of contrasting metals - one polished silver and one matte obsidian - suspended on a chain of tarnished iron. Ancient runes spiral around both bands, creating words that seem to shift when not directly observed. The space between the rings pulses with a faint, ghostly light, and when the Covenant detects a broken promise, both rings spin toward the oath-breaker with an almost eager intensity. It whispers faintly when held, as if remembering old promises that remain unfulfilled.

The Covenant serves as both revelation and enforcement in the Underdark's tag economy - it reveals unfulfilled agreements between delvers and can compel their completion, creating a reputation-based system where past promises carry weight. This creates narrative tension around the mercenary truth that your word is your most valuable currency in the depths.