#16
Hint 1: So a bunch of mushrooms took over the world. Basically en escort mission made into a full game. 
Hint 2: Sequel comes out early next year
Hint 3: Opening scene has your character losing a loved one. 

#12
Hint 1: Third (3rd) entry of a franchise. So you are basically a mercenary that hunts monsters. 

A game which I don't often see featured as a classic great game, although it really is. This Wizardry spinoff is one the greatest RPGs of all time. It's battle system is classic but works well. The scenario and story are interesting and dark, the design of enemies is inventive and it has nicely implemented characters. This whole package is pretty great.

Tale of the Forsaken Land is a dungeon crawler. You create your character quite freely and then go hire more people to form a party to start exploring the labyrinth. The story background is the kingdom of Duhan, which is pretty destroyed as an event called the Flash struck the land. Now a dangerous labyrinth exists within the ruins with lots of monsters. You set off with your party to explore the labyrinth and discover the reasons for the recent events.

Although there can be humorous moments, the overall tone of the game is pretty dark. This is expressed by colors, music, the quests you get from the people in the Inn and how the story unfolds.

The fighting system is quite classic, but has some twists with the allied actions. In the labyrinth you have additional things to do, like open new paths or unlock trapped treasure chests.

This game is a pretty gem, clearly underrated.

https://www.youtube.com/watch?v=AvWkzFNTBo0

Another hint for #11:

#13 Guessed by The_Liquid_Laser: The Legend of Zelda: Breath of the Wild

#12 Guessed by Jpcc86: Baldur's Gate

#11

a) On the first day man was granted a soul and with it clarity.

b) On the second day upon Earth was planted an irrevocable poison.

Nope, but it's the right franchise!

16.  The Last of Us

12.  Super Metroid

Heartgold/Soulsilver?

16 its correct!

12 isnt tho

Correct.

Nope. See above.

Correct!

Guessed by Mnementh

This is a great, whimsical adventure game with varied levels and enemies, a fantastical vibe and voice work and a memorable main antagonist. This antagonist is an evil wizard, that kind of looks like a jester, who makes for an interesting final battle. The first part of it has two armies fighting each other, where you must empower your allies to help them defeat the enemy army. Then, in the second phase of the battle, the wizard turns himself into some sort of dragon. This is preceded by a particularly hilarious cutscene. The game is filled with memorable moments, but this final encounter in particular is something I will never forget.