In Battle, a card with the term "until your next turn" means that the effects of the card will end at the very start of your attack turn - specifically BEFORE you draw a card from your deck. If the battle ends before "your next turn" the card also gets discarded and effects ended. If you play the card during adventure phase, the card gets discarded the moment you enter a battle.

Cards that says "Stays in Play" does not get discarded when played. Instead, they are placed down next to your hero card in front of your play area and you tilt them to use its effects.

These cards do not get discarded (even after battle and round completion) unless you choose to discard it yourself or the conditions written on the card itself is met. Examples of cards that stays in play: Weapons, certain Skills& Spells, Elements.

No, You only get to flip 1.

The maximum amount of monster tokens that can be found in a tile is 4 at all times. This means that there is no scenario which you can "obtain" or "battle" more than 4 monster tokens from a single tile.

This means that some quests or aggravating may cause monster tokens to shift during adventure phase.

When there are more than 4 monster tokens on a single tile, half of the monster tokens (rounded up) needs to be moved to an adjacent tile towards the city tile. The monster tokens that bleeds on to the adjacent tile is up to your party's discretion. Use this fact strategically.