From Dungeons and Dragons: Monster Manual I, the Piercer was a cruel joke to the collection of creatures. It was a Dungeon Master’s evil ploy to reign unholy terror by impaling an unsuspected adventurer below.
“… these monsters are indistinguishable from stalactites found on cave roofs.”
From Dungeons and Dragons: Monster Manual I, the Zombie was an undead creature, a corpse animated by evil magic-users or clerics.
“… typically found near graveyards, in dungeons, and in similar charnel places.”
The Bulette (or Landshark)
From Dungeons and Dragons: Monster Manual I, the Bulette was a magical hybrid born from a mad wizard’s dream. As a DM, I rarely used the landshark. It was a novelty creature making rare appearances. Calling a break to the action while a dorsal fin sticks out the earth like a B-movie just wasn’t in my script.
“… cross breeding of a snapping turtle and armadillo with infusions of demons’ ichor … feeding on horses, men, and most other flesh,”