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Sources
The Ecology of the Umber Hulk (Dragon Magazine #152)
Monster Manual 1st Edition
Monster Manual 2nd Edition
Monster Manual 3rd & 3.5 Edition
Monster Manual 5th Edition
Lords of Madness: The Book of Aberrations
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Music
Crypto by Kevin MacLeod
Link: https://incompetech.filmmusic.io/song/3569-crypto/
License: http://creativecommons.org/licenses/by/4.0/
Lightless Dawn by Kevin MacLeod
Link: https://incompetech.filmmusic.io/song/3982-lightless-dawn/
License: http://creativecommons.org/licenses/by/4.0/
Lost Time by Kevin MacLeod
Link: https://incompetech.filmmusic.io/song/4005-lost-time/
License: http://creativecommons.org/licenses/by/4.0/
Darkest Child by Kevin MacLeod
Link: https://incompetech.filmmusic.io/song/3615-darkest-child/
License: http://creativecommons.org/licenses/by/4.0/
Relaxing Piano Music by Kevin MacLeod
Link: https://incompetech.filmmusic.io/song/4273-relaxing-piano-music/
License: http://creativecommons.org/licenses/by/4.0/