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Bonus: Share your idea for an alternative flesh rune design if you feel it should be different.
I think it be nice if the icon looked a little more like say the osrs reflex prayer icon, which is a brain but if you simplified it a bit and colored it to be the magenta-like red of the flesh altar it would pass for a lump of flesh.
https://oldschool.runescape.wiki/w/File:Improved_Reflexes.png