Spellbook interface icons from the OSRS Wiki (Jagex game artwork).
https://oldschool.runescape.wiki/images/Standard_spellbook.png
https://oldschool.runescape.wiki/images/Ancient_spellbook.png
https://oldschool.runescape.wiki/images/Lunar_spellbook.png
https://oldschool.runescape.wiki/images/Arceuus_spellbook.png
