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"But using just nails isn\'t enough. They\'re too smooth and can be easily pulled out." Zhang Yi explained while taking out a box of long screws. "Combine these with the nails. The nails have better penetration, while the screws increase the damage. Understand?"

The two women listened attentively. Seeing the sharp nails and the spiral grooves on the screws, they could imagine the excruciating pain when pulled out, taking chunks of flesh with them. Yang Siya\'s feet instinctively curled up at the thought of such pain, while Zhou Ke\'er, being a doctor, was more composed.

Zhang Yi took a few minutes to craft a simple trap with the board and nails. "We need to make at least 1000 of these nail traps! Spread them within a 100-meter radius around the villa!"

Next, he pulled out a large animal trap with jagged, sharp teeth that looked terrifying. "You\'ve seen these on TV. They can snap a wolf\'s leg clean off. For humans, it can pierce through flesh and hit bone, essentially incapacitating a person."

"These need to be placed within the inner ring of the nail traps to avoid being detected by probing tools."

"You two handle these traps while I take care of the rest!" Zhang Yi instructed.

Zhou Ke\'er and Yang Siya nodded and started making the nail traps, hammering away diligently. Zhang Yi was also busy, observing the terrain outside from a window. The only routes to Villa 101 were two pathways. Zhang Yi recalled finding two explosive landmines in the Tianhai City military armory, perfect for burying in these routes.

Caution was paramount; the mines could destroy tanks and armored vehicles, let alone people. Zhang Yi realized the traps\' first use would be the most effective. If someone used tools to clear the nails, he needed a countermeasure.

After half a day, the three finished making 1000 nail traps. Yang Siya\'s hands were blistered, but she didn\'t complain, knowing her value to Zhang Yi was less than Zhou Ke\'er, a doctor. She needed to prove her worth to maintain Zhang Yi\'s favor.

Zhang Yi appreciated her effort, even if he didn\'t say it. "Alright, let\'s get to work!"

They put on their winter gear and went outside to set the traps around Villa 101. Zhang Yi meticulously supervised their placement and corrected any mistakes.

"The nail boards shouldn\'t be too loose! Ideally, when someone steps on one, they fall and land on another, which could pierce their chest, face, or neck, killing them instantly."

"Bury the boards just enough to cover them. The snow will hide them completely soon."

Despite this being Zhang Yi\'s first time setting traps like these, his survival experience in the cutthroat environment of Yuelu District had given him a wealth of knowledge in killing enemies effectively.

Zhou Ke\'er and Yang Siya followed his instructions carefully, though they were nervous about stepping on the traps themselves. Zhang Yi kept a close watch to ensure their safety.

Once the nail traps and animal traps were set, Zhang Yi cautiously avoided them and moved to the two pathways. Using an entrenching tool, he dug two deep pits over a meter deep and carefully placed the explosive mines inside.

Fully armored for safety, with a dimensional gate ready to absorb most of the blast if something went wrong, he buried the mines and smoothed the surface with snow to leave no trace.

These remote-detonated mines wouldn\'t go off from pressure but could be triggered electronically by Zhang Yi when needed, making them perfect for ambushing large groups or powerful enemies.

Next, Zhang Yi devised a plan to prevent anyone from clearing the traps with tools. He tied steel wires to grenade pins and buried them in the snow. Whether kicked or triggered by tools, these would explode, creating further obstacles.

After meticulously placing about 30 grenade traps around Villa 101, Zhang Yi ensured that anyone approaching would have to sacrifice many lives, possibly dozens.

"That should do it," Zhang Yi muttered, exhaling a breath of white steam. The traps might be less effective against professional armed forces, but approaching the villa would be lethal for untrained enemies.

Zhang Yi had two more defenses besides the traps. He glanced back at the fortress-like shelter, its 10-meter-long tunnel equipped with sleep gas, tear gas, and high-temperature flamethrowers capable of melting steel.

And the final line of defense was Zhang Yi himself.