Original spider textures: AspireMint
Original goblins textures and models: Francisco "FreeLikeGNU" Athens
Original tesseract: Claudio Rocchini (cc-by-sa 2.5), https://en.wikipedia.org/wiki/File:Runci_trunc_tessaract.png
Original meteorite: MeteoriteKid (cc-by-sa 3), https://en.wikipedia.org/wiki/File:Oriented_Taza_Meteorite.jpg
Original tanzanite: Chromalys (cc-by-sa 4), https://en.wikipedia.org/wiki/File:Trichroic_Tanzanite_Gem_-_blue,_violet_%26_purple.jpg
Original aquamarine: Diamondexpert (cc-by-sa 2.5), https://commons.wikimedia.org/wiki/File:Gems_aquamarine.jpg
Original garnet: von de Wela49 (cc-by-sa 3), https://en.wikipedia.org/wiki/File:Garnet_cut.JPG
Modified radioactive ore: everamzah
Original DNA: Zephyris (cc-by-sa 3), https://en.wikipedia.org/wiki/File:DNA_Structure%2BKey%2BLabelled.pn_NoBB.png
Original moonstone: Didier Descouens (cc-by-sa 4), https://en.wikipedia.org/wiki/File:Pierrelune.jpg
Wallhammer images by the eminent DonBatman (DWYWPL), https://forum.minetest.net/viewtopic.php?f=11&t=13484&hilit=masonry+hammer