The Abominable Electronics Unholy Grail is an analog delay pedal with a built-in boost and reverb in one box. RockBoard's PedalPedia describes it as "the ultimate shoegaze pedal," and it is aimed squarely at players who want washes of repeats, a push into the front of an amp, and ambience without stacking three separate enclosures1. It sits in the delay family, alongside the wider field of Delay Pedals, Reverb Pedals and Boost Pedals that it combines.
What it does
The Unholy Grail covers three jobs at once. Its core is a delay, and around that it adds a reverb section and a boost that RockBoard's PedalPedia says is controllable via the "burn" knob, a change from earlier versions of the pedal1. For a shoegaze-style setup, that means one pedal can supply the repeating backbone, the ambience behind it, and a level push, rather than a chain of three units.
The maker's own listing sums up the return of the pedal this way:
"The Unholy Grail is finally back - our flagship delay w/ built in boost (controllable via the "burn" knob this time) & R"
Power and practical notes
The pedal runs on 9V DC, center negative, the standard arrangement for most pedalboard power supplies1.
The Unholy Grail had been out of production and is now available again, which the maker marks by saying it is "finally back"1. If you are comparing it against used listings, note that the boost control on the current version works through the Burn knob, a change from earlier versions.
Videos
Abominable Electronics
Abominable Electronics
Paul ZillaX
Sources (1)
- Unholy Grail by Abominable Electronics, RockBoard PedalPedia, 2026