Hi Zanza, I'm still a newbie in that game but I'm gonna give you a quick answer to your questions. Experts please, correct me if I'm wrong.
I am in a room with only one empty field around it. I explore and get a trap room. i have to place the trap room on the only empty field. now i have to take the next tile and get a room. i cannot place it anywhere around to the room where i am on. do i discard the tile or place it somehwere else in the dungeon?
You are wrong 'cause you don't have to take another tile after a trap. If you are on the 1st level, you only have to flip the next tile but don't place it! Unless it's again another trap.
If you are on the 2nd level you have to do nothing after exploring a trap.
Same question for medium rooms if there is not enough space to place them.
The rules say this but i dont understand this somehow: If there is not enough space to place the medium room adjacent to your tile, you cannot explore the Rune room. You’ll need to move elsewhere to do it.
In other words, you are not allow to explore from that room right now. Move to a tile with adjacent space enough to explore the next medium room.
Valerie Starting Ability: Do i get the shield in every turn when i am in the same room with the same undead?
Lets say i am in a room with an undead so i get the shield symbol. i use it when fighting another monster in the room. i end my turn and stay in this room with the undead. do i get a new shield from the starting ability in the next turn? or do i have to move to another room with another undead?
You get a new shield (symbol) every turn while in a room with any undead monster.
Another Question for Valerie Starting Ability: Can i just keep an undead as my "pet" and let it follow me around to get a free shield in every room/turn?
Haha good idea. You'll need to fight him every turn but, why not.
Is it just me or is it sometimes really hard to keep track of your symbols when there are no physical markers?
I had the same feeling on my first plays. You can find tokens for the symbols in "files" section in case you need them.
In my turn, when i have no dice left, i use the free step token to explore. i get a room title where i have to place a monster on it. now i have to let the monster attack me with no way to attack/defence right?
When i have attacked all monster on my title, i can get out of the room and explore somewhere else even if i didnt kill the monsters?
Of course (if there are no Spiders).
When i level up, can i uncover both cards and choose the ability one i want or do i have to take it random?
Feel free to choose an ability.
There is one exp symbol on rune rooms. however the rune room gets immediately replaced with a medium room. do i get 2 exp? one for rune room and one for medium room? the rules say that you get only 1 exp for medium room. if that is so, why is there an exp symbol on rune rooms?
From my point of view, the small rune room is a small representation of the medium rune. So there is just 1 exp.
Schmetterling Capture Ability: can i keep the token through the game or do i have to use it in my current turn?
You can keep it.
Remember that you can only use the token on the roll phase, so it's too late to use it in your current turn.