All the agents of the Division were stationed at temporary watchtowers around the area which this Mr. Jianmen Yu was commissioned by Josephine Wong to cleanse. When the rain started, they all started seeing the same thing: the buildings in this area started crumbling into smaller and smaller chunks, and eventually became ashes and colorful sand on the ground, while at the same time steam started coming out of different parts in the area.
Some of the agents were keen enough and lucky enough to see some monsters made of dark liquid or shadows made of dark smoke trying to crawl out from under the ground, but most of them were barely able to come up in full and solid shape, and none of them was able to make it very far under the rain.
"Stay in position, this is just getting started." Jianmen's voice reached all agents of the Division at the same time: "When you see the wooden stakes lighting up, be prepared to use your weapons. I am quite a fan of your Wyvern Breath flamethrowers, so feel free to use it if needed. Don't worry, the rainwater wouldn't affect the flammability of the unclean presence."
The moment Jianmen finished the sentence, three long tentacles burst from the ground around Jianmen, and some of the agents paying attention to the surroundings of Jianmen immediately called out to him.
Three lightning fast finger strikes landed on the three tentacles and obliterated all of them before they could get close to Jianmen. The next moment Jianmen slammed the ground with his right palm, causing the ground beneath him to crater and exposing some kind of rough underground tunnel system. When he fell into the underground tunnel, he saw that there were monsters of all shapes and sizes surrounding him from underground. These monsters' bodies were made of the same dark liquid or dark smoke, but in much higher density and they were using some kind of shells made of actual rock to block off rain water so they were able to remain in shape underground for now.
"Clever." Jianmen scoffed: "But not clever enough."
Jianmen raised his hand, a blinding bolt of lightning shot from the clouds above and struck his hand, then smaller lightning bolts shot from his body in all directions around him at all the monsters around him.
Some kind of clustered explosion erupted from the crater into which Jianmen fell, earth, sand and body parts of different creatures were thrown into the air. A few more orange and golden lightning bolts lit up the sky some more, and the rain just kept getting heavier, it wasn't long before the agents stationed around the area lost most of the visibility into the inner parts of the area.
"I'm hearing abnormal noises from inside the area. Everyone stand guard! All agents be on alert!" Agent Hall all of a sudden started hearing some strange yet disturbing energy flow.
Two agents behind Agent Hall and Agent Jill readied their Wyvern Breath and aimed them at the direction they were supposed to guard against.
It was silent for a while, then they all heard a loud and disgusting belching sound - a large seven legged monster with bricks, wooden boards and normal debris from buildings, roads and other types of civilian constructions on the surface of its body and thick solidified dark liquid and smoke as its body ran towards their position while its body was chipped away by the rain.
"On my mark!" Agent Hall raised his handgun and was ready to open fire when the monster got in the optimal range.
But the monster made a left turn when it got near one of the wooden stakes, before it even got close to their optimal range and started running towards a different direction.
"Welp, at least we know the wooden stakes DO work." Agent Jill laughed in relief.
Holes opened up on the ground, and more of these monsters started crawling up - all of them also had normal material covering their bodies to minimize their exposure to the rain.
Yet these monsters were still under the influence of the giant array formed by the wooden stakes, even though from the agents' view they almost made it out of the area by just minimal distance, they were still directed back into the area, and were directed to keep running aimlessly while the rain kept washing their evil energy and existence away.
"Help! Help!" a pale woman in broken rags and with a head of long hair ran towards the position of Agent Hall and Agent Jill. She seemed weak and sick in the pouring rain, and she didn't seem to be too impacted by the rain, besides getting wet. When she moved, both Agent Hall and Agent Jill could see that she seemed to have a big belly.
"She's pregnant." an agent behind Agent Hall and Agent Jill said: "I think we should help her."
"Stay where you are, agent, this is not a human." Agent Hall immediately responded: "We wait here."
"I agree. She doesn't seem right." Agent Jill said: "Hold your position - I don't think there could even be a human here."
"Help me! Please!" the woman cried and looked at the direction of the watchtower: "Please help me! Please! I was imprisoned - I just escaped!"
"She could see us!" the other agent behind Agent Hall and Agent Jill spoke with a raised voice: "We should help her now!"
"Stand down!" Agent Hall was the second in command in this whole operation, so he immediately dismissed the suggestion of the two agents behind him: "This woman doesn't look right, we will wait here!"
"Uh… Agent Hall, this is Benjamin, we saw a woman heading our way asking for help. We think she's pregnant." another agent asked Agent Hall through the comms: "Looks like she's not impacted by the circle from the wooden stakes. Please advise."
"Stand down, stand down." Agent Hall ordered: "All agents, stand down, no matter what you see coming out of the area. Stand DOWN!"
"Mr. Yu? Can you hear us? We need your help here." Agent Jill asked through the comms.