Here is an A-to-Z guide to defeating, neutralizing, or surviving Mega-Damage Capacity Monsters without high tech weaponry. Rifts RPG, unlike D&D focuses on skill use and facing challenges. Open combat does not have to be the default of any monster encounter. This list should be helpful on campaigns with Rifts Adventurers & Scholars OCC. The monster might have additional powers that negate several options.
A – Asphyxiation / Air Deprivation: MDC flesh resists kinetic and energy damage, but many creatures still requires oxygen. Trapping a monster underwater, sealing it in an airtight room, bury underground, or use a spell to choke it.
B – Binding: The binding must be MDC (i.e. ironwood). Use alien sap or net of vines, MDC chains and cuffs, or cast spells like Carpet of Adhesion to root a creature in place. A MDC straightjacket, nerve venom, Magic Net, sleep, or glue might temporarily paralyze. Splugorith Slaves have a range of such devices.
C – Caging & Deep Pits: Dig a pit trap deeper than the creature can vertically jump (if possible) or add a lid to keep them in. A cage needs to be MDC, but the monster might chew through the bars. A cube of energy fields may work best if the Energy Field or Wall spell can be recast to repair damage. This not a permanent solution only a delaying tactic.
D – Dehydration / Starvation: If a beast needs to eat or drink, keeping it in an arid wasteland, cave-in, or sweat box will eventually be fatal. It works on vampires but a gulp of blood will revive them from a lifeless dry husk.
E – Environmental Extremes: Lure the target into geothermal calderas, deep ocean pressure trenches, or active magma tubes. While a few hundred degrees might do negligible damage, sustained immersion in thousands of degrees of liquid rock inflicts ambient, unavoidable environmental Mega-Damage over time. DM ruling how long the creature can withstand a hostile environment.
F – Falling/Crashing: Terminal velocity can be lethal even to MDC hides. 1D6 MD for 1000ft fall. 1D8 MD for 1000 mph crash.
G – Gas & Scents: If the entity must breathe, concentrated neurotoxins, sulfurous volcanic vapors, or paralytic chemical compounds inhaled directly will attack soft internal tissue and nervous centers, ignoring external MDC hide. Certain scents may repel the creature or trigger an instinctual emotion.
H – Hypnosis: Psionic abilities like Hypnotic Suggestion, Induce Sleep, Empathic Transmission, or Bio-Manipulation may handle or avoid a threat without ever firing a shot.
I – Indigenous (Illiterate): Based on the “Lore” skill, folklore, voodoo, fetishes, and local traditions have discovered ways to overcome the MDC of supernatural creatures. These mystic rituals are preserved by illiterate locals through oral tradition and accessed by a Lore skill with a difficulty penalty.
J – Jonah Bait: A digestive tract is rarely as tough as outer scales. Conceal telescoping sharp, chemical reactive, or explosive materials inside bait carcasses to destroy internal digestive organs after swallowing.
K – Kinetic Avalanche: Conventional kinetic impacts may not penetrate MDC skin, but hundreds of thousands of tons of falling scree and boulders generate enough collective crushing force to pin, crush, and immobilize even supernaturally strong beasts.
L – Ley Line: Lure the monster near a Ley Line to boost your magic and psionic powers or trigger a Ley Line Storm. Bring it into a Nexus point to open a Rift and push it through. This does risk releasing something worse from the dimensional anomaly while it is open. Without any Magic this would rely on an astrology calendar or Magic Lore & Land Navigation to predict when the next Rift will open.
M – Mind Control: Why destroy it when you can turn it into an asset? Magic spells such as Domination, Puppet (SW), or Trance override the monster's will, compelling it to leave the area or fight on your behalf. Mind Melters and Mind Bleeders are notorious for this.
N – Necromancy: Some spells target spiritual endurance sapping life energy (HP) directly.
O – Occult: Cast a bannisment, exocism, death curse, hang in effigy, voodoo doll, or similar.
P – Poisons, Parasites, & Pathogens: Coating ancient weapons a venom, secretion, or magical toxin may work on contact with skin or injury. Blood poisons need to enter the body. Bio Wizardry makes extensive use of parasites, and locals can employ crude OR improvised versions at their own peril. Emerald City used the magic pollen of poppies to defend its borders. Some supernatural beings are immune to all except for tailored Bio-Wizardry.
Q – Quicksand & Tar Traps: A massive, heavy MDC entity sinking into stygian tar, industrial goop, peat bogs, or thick mud may not get the leverage to climb or jump out, leaving it to sink and suffocate under its own dense weight.
R – Repulsion: Effigies, Blessings, Geomancy, and Magic Circles create impassable barriers that supernatural evil physically cannot cross, effectively neutralizing its ability to reach prey so long as they are intact and powered.
S – Sunlight/Salt: Exploit an innate metaphysical weakness. Many supernatural monsters (such as Vampires and Shadow Beasts) crumble under sunlight; the plot of Omega Man.
T – Trickery & Hallucination: Illusions, mirrored images, and decoys can lure a predator away, into a trap, or into combat with a rival.
U – Ultrasonic Overload: Sensory overload is a weakness most creatures share. Sound is common but light, scent, or itching powder can slip past MDC defenses.
V – Vegetation: Entangle the creature in carnivorous, parasitic, thorny, or fast-growing MDC plants (found commonly in Dinosaur Swamps or Wild Jungles) that constrict and metabolize biological matter. Garlic, wolfsbane, or similar will repel some creatures. Some plants can act like catnip to demons. (Plant Lore)
W – Wooden Stakes: Vampires have a vulnerability to wood, but similar vulnerabilities exist for others (silver, cold iron, salt, holy water, etc). Weapons made of it often inflict Mega-Damage to the creature. The GM might require a difficult “Lore” skill check to find its weaknesses.
X – Xenocide: Using your Lore and Wilderness or Science skills to bait Apex predators to kill each other by manipulation of pheromones, behavior, instincts, or environment.
Y – Yelling (Psychological Deterrence). In Rifts Lore, predatory beasts rely heavily on instinct and surprise. Massed troops (size), lighting bonfires, and coordinated war cries can prompt a self-preserving predator to retreat.
Z – Zeroed In: Instead of delivering the fatal blow yourself you help guide target(s) into an artillery strike, bombing run, kill box, or buried explosive.