It's actually "Adventure Theory", and it's a real thing.  I think I saw an advertisement for it during Judge Judy.

I agree, it makes no sense.

But this led to a "heated" debate once already, so I'll just shut up early this time. 

What GV said. I love this tree, and certainly don't think it should be removed.

Look at it this way: they're researching the locations of forgotten notable places, resources, and leads on important people wandering the wastes. Imo, there could be more quest types (and more involved) and notable locations, but I would be sad if it got the axe...

"You just want your adventurer go to the next level of dungeon. Honestly, I hate Adventure Tech and hope it would changed."

Yeah, that's pretty much what I'm saying. I think the adventuring component is a fun aspect of the game. I'm not sure I understand what your point is, I'm sorry. I'm guessing that English is a second language for you (and I apologize if that's incorrect), so I really don't want to argue about it.

Yes, English is not my mother language. And even not my second language, so I'm sorry if my english is bad

I think, rather than you upgrade the adventuring tech to get the higher level of monsters, why not improve the Inn purpose of the game, just like some people suggest in this forum?

I think, we can make the Inn as the "quest centre" for the Adventurers. You go there, look the list of the quests, then solve the problem. When you have questing enough (for example you have finish all the E rank quest) the monsters be become stronger. This way, the monster spam trigger can be controlled, as there are only limited level of monsters in the wild (E, D, C, B, A, S, H)

"Yes, English is not my mother language. And even not my second language, so I'm sorry if my english is bad"

Well, in that case, that's pretty f'ing impressive. So, I'm guessing that your intent in having inns as quest centers is to have quests that replentish over time? I actually think that this is a good idea (if it can be balanced within reason), but again, I think that having different "levels" of quests/locations is a good mechanic to reward the player for pursuing a tech line other than warfare.

I would say there are two schools of thought on adventuring in a fantasy universe. The first is the idea which is similiar to most computer rpgs where you go out, explore, and level, all the while finding new and exciting things in the universe. The second is the idea which is similiar to most fantasy fiction/Table top rpgs where adventurers take time to ask around about different locations and happenings. Consider that Gandolf spent years researching the ring, the major players, etc, before returning to frodo to start the quest to destroy the ring. If we take a more realistic approach, adventurers just wondering into the wilds in hopes of quests/loots/etc. would find themselves starving with no sense of direction before too long. So from my pov, yes you need to do research to adventure.

The game needs more content - not less, and in this particular case the rewards need to be far higher. As it stands now, the only logical research path is towards Lord Hammer and Vigilant Minion for the Empire faction only.

Keep researching the Quest adventure tree....  researching the recruiting and resource adventure trees don't help.

First people asking for Diplomacy getting axed. Now Adventure. One day we will only have Warfare and a battle simulator.