Nanna Bryndís Hilmarsdóttir

In this photo, Nanna can be seen playing a Martin 000-15M, which corroborates with this page of Martin Guitar's website, which states that Of Monsters and Men's main guitars are a Martin D-28 and a Martin 000-15M.

According to her many Instagram posts, she used this amplifier as the main amplifier during her recording time.

Nanna can be seen playing the guitar at 8:50 during "Empire"

At the beginning of the video, we can see Bryndis's pedalboard, which includes the Eventide Space Reverb pedal.

At the very beginning of the video, we can see Bryndis's pedalboard, which includes the EarthQuaker Ghost Echo pedal.

From an IG post, Nanna appears to be playing a Candy Apple Red Fender Jaguar

In this image of the band Of Monster and Men performing, Nanna's Martin guitar has an L.R. Baggs M80 pickup. She uses this guitar with this pickup for the majority of live performances.

"Over the past few years I had used an e 945 with various vocalists - Isabelle Campbell, Arab Strap, Emma Pollock, Idlewild and others,” says Richie. “I’ve always really liked the 945 - it sounds really natural, the clarity is great and you can get a good vocal level. If you’ve got any quiet vocal parts you can get that bit more gain on it, you can push it up a bit more without it sounding pushed."

“I bought a 945 some time ago and if there was any chance I could use it, I did. It made sense to try it with Of Monsters and Men - they like it because it sounds good in their in-ears and keeps out much of the spill from the drums and backline instruments.”

-Richie Dempsey, Front of House engineer; Sennheiser Interview

In this photo, some of the pedals can be seen on the floor, including the MXR Carbon Copy delay pedal.

In this photo, some of the pedals are visible on Bryndis' board, and it includes Boss RE-20 space echo pedal.

In this photo, taken at Bud Light Festival 2015, we ca see Bryndis performing, as well as her pedalboard. There is also the Boss LS-2, judging by the colour of the knobs.

In this photo from Shoreline Amphitheater concert, we can see couple of Dunlop Tortex picks attached to the mic stand.

In the beginning of the video, we can see a part of Bryndis's pedalboard, which includes the Radial J48 direct box.

In this photo, which shows some of the Bryndis' recording gear, the Voodoo Lab Pedal Power 2 Plus power supply is visible.

In this photo, Bryndis' pedalboard is visible, which includes the Boss RC-30 loop station. It is not the RC-20XL model because there aren't any buttons on the left side of the pedal.

At 3:59 minute mark, there is Dunlop Tortex capo visible attached to Nanna's Fender acoustic.

Nanna Bryndís Hilmarsdóttir can be seen playing a Martin F-65 guitar during her performance with Of Monsters and Men of "Ordinary Creature" on The Tonight Show Starring Jimmy Fallon, as documented by the show's official YouTube channel.