Year 1: The Invasion Begins In an unforeseen turn of events, the Grenishes, these pure green dinosaurs measuring only a fifth of the size of humans, with their intimidating red vertical eyes, launch an invasion on Earth. With their knowledge of karate, they prove to be formidable opponents. Year 2: Initial Resistance Humanity initially underestimates the Grenishes, as they are much smaller in size compared to humans. However, they quickly learn that their size does not diminish their brutality. Grenishes ruthlessly attack animals, biting and causing excruciating pain. Animals face immense suffering, as the Grenishes show their malevolence towards them. Year 5: Global Panic News of the Grenish invasion spreads rapidly across the world, causing panic and chaos as people struggle to comprehend this new threat. Different nations attempt various strategies to combat the Grenishes but find them difficult to defeat. The brutality and pain inflicted by the Grenishes upon animals sparks widespread outrage and further fuels the determination of humanity to fight back. Year 10: International Collaboration Realizing the need for unity against the Grenish invasion, nations set aside their differences and collaborate on a global scale. International teams of experts are formed to study and understand the Grenishes' anatomy, behavior, and weaknesses. Significant resources are dedicated to developing advanced weaponry and technology to counter the Grenish threat. Year 15: The Grenish War Humanity goes all-out in a war against the Grenishes. Armed with newfound knowledge and advanced weapons, they launch a series of coordinated attacks on Grenish colonies across the globe. The Grenishes fiercely defend their territories, utilizing their karate skills to inflict heavy casualties upon humanity. Year 25: A Turning Point After years of relentless fighting, humanity finally starts to turn the tide. By analyzing the Grenishes' fighting patterns and weaknesses, strategists devise new tactics that exploit their vulnerabilities. These tactics, combined with humanity's increasing resilience and adaptability, begin to wear down the Grenish forces. Year 30: The Final Stand The Grenishes, realizing they are facing a losing battle, gather their remaining forces for a final desperate assault on humanity. The human forces, battle-hardened and armed with the knowledge of Grenish weaknesses, mount a massive resistance. After a fierce and prolonged battle, humanity emerges victorious. Year 31: Rebuilding and Recovery With the extinction of the Grenishes, humanity emerges from the devastating Grenish War, scarred but triumphant. The world comes together to rebuild, restore ecosystems, and rehabilitate the animals that suffered immensely at the hands of the Grenishes. Lessons are learned, and efforts are made to ensure that such an invasion can never happen again. Years pass, and the memory of the brutal Grenish invasion fades into history. Humanity cherishes the hard-won peace and remains vigilant to protect the Earth from any potential future threats. The Grenishes, once fearsome and malevolent, become a dark chapter in the collective memory and a reminder of humanity's resilience and determination.

In a hypothetical scenario where Grenishes have their own planet, their society and culture would likely reflect their ruthless and brutal nature. Here is a glimpse into the possible society and culture of the Grenishes: 1. Hierarchy: Grenish society would likely have a strict hierarchical structure, with each Grenish's position determined by their combat prowess. Those with exceptional karate skills would hold higher ranks and enjoy privileges, while weaker individuals may be seen as inferior. 2. Martial Arts Focus: Martial arts, particularly karate, would be deeply ingrained in Grenish society. Training in various forms of combat would be an essential part of Grenish upbringing, and their culture would highly value physical strength and combat abilities. 3. Tribalism: Grenishes might form tribes or clans based on their fighting prowess. These groups would fiercely compete with each other to establish dominance, leading to tribal rivalries and conflicts. Each tribe might have its own symbols, rituals, and traditions. 4. Strong Collective Identity: Grenishes would have a strong collective identity, emphasizing solidarity among their own kind. They would view themselves as superior to other species, considering them mere prey or obstacles. Their society would prioritize the well-being and advancement of Grenishes above all else. 5. Harsh Justice System: The Grenishes' justice system would likely be severe and uncompromising. Punishments for individuals within their society who transgress the established laws or challenge the hierarchy could range from severe physical penalties to exile or even death. 6. Communal Living: Grenishes might live in communal structures, with a focus on shared resources and protection. The concept of individual possessions may not hold much significance, and communal living spaces would provide a sense of security and unity. 7. Art and Expression: Grenish artwork would revolve around themes of strength, combat, and domination. Visual arts might depict intense battles or triumph over adversaries. Their literature and storytelling would largely center on heroic tales of martial prowess and conquest. 8. Limited Compassion: Due to their brutal nature, Grenishes would likely have limited compassion or empathy towards other species. Their culture may not emphasize compassion or nurture, and they may view pain and suffering as a measure of strength. It is important to note that the culture and society of the Grenishes depicted here are purely speculative, based on the given characteristics and behavior of Grenishes in the initial prompt.