From Halopedia, the Halo wiki
Misericordia are a kind of blade-tool used by the Forerunners. They were presumably energy-based implements of some kind, as the energy daggers later developed by the Sangheili were built based on them.
- "Misericordia" translates from Latin as "Mercy" or "Compassion".
- ^ Halo Encyclopedia (2022 edition), page 307