A random thought on a Shadowdark creature and the loot it may leave behind.
An animated skeleton with a glowing gem set in its forehead.
AC 15 (chainmail + shield), HP 11, ATK 1 longsword +1 (1d8) or 1 javelin (far) +0 (1d4), MV near, S +1, D +0, C +2, I -2, W +0, Ch -1, AL C, LV 3
Undead. Immune to morale checks.
Reflecting Cabochon. First hostile spell with a spellcasting check less than 20 is reflected at caster.
Reflecting Cabochon
A one-inch gem polished to a mirror sheen.
Benefit. When struck by hostile spell, destroy reflecting cabochon and roll DEX (DC equal to spellcasting check result). If you’re a spellcaster, may choose to make spellcasting check instead. With success, reflect spell at original caster.