Resonant Stem

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"This is a broken Resonate Stem for Project: CB.NAV. You can hack several of them together to create a working Override Frequency. Override Frequencies contain harmonic code so only one can be created at a time "
— In game description

Resonant Stems are an uncommon consumable added in Destiny 2, Warmind (expansion). They can be obtained by completing activities on Mars. The player can combine 4 of them into a Override Frequency.