Remember that Giant Walking Tree in ffxi? It had a ton of hp, anyone can engage, and it would roam all over Vanadiel for days. I don't remember what it dropped, but I want a special event like that for some holidays, but a much bigger mob. Like a lalafell would be shorter than it's toe.

This Yoshida NM would walk around crushing players that dare engage it, saying things like "Rawr! How dare you players disturb my 3 hours of sleep! I will crush you like ants!" Then it would shoot laser beams from its eyes, and burn buildings. Then players resting at camps would be like "Yoshida is coming! Yoshida is coming! Run for your lives! AHHHH!" A few handful of adventurers will try to engage it, but find that their strongest attacks futile, nothing but a small scratch.

Now, hear me out, it doesn't even have to be Yoshida, it can be part of the Garlean Empire's technological marvels, Mecha-Yoshida!

Great idea or the greatest idea?