This cache is not at the posted coordinates. To find the treat, you must first solve the trick.
If you've ever cached in this area before, you know it's home to many creepy containers. From vampires to mummies to even Frankenstein, Mill Run Reservoir is definitely Altoona's premier spot for everything scary. To solve this puzzle, consult all of the nearby monsters to help locate a new fiendish friend.
(Σ Vampire) + 16
(Σ Werewolf) - 1
(Σ Bleacher Creature) + 2
(Σ Ghost) - 5
(Σ Mummy) + 15
(Σ Witch) - 7
(Σ Zombie) - 12
(Σ Frankenstein) - 6
This puzzle is not intended to be difficult; regardless, do not hesitate to reach out for an extra nudge if you need one!
Congrats to mrGreen317 and littleEEE for being first to fright!