1) if the card that say to put all the enemy from the discard pile to the deck, is this also apply to the daungeon, highland and city decks???
You're talking about Discordant Dirge Event from Sacred Pool.
Take all Enemies in the discard pile, shuffle them, and place them back on top of the Adventure deck. The Dirge then fades to the discard pile.
As any card, it depends on which deck you draw it from. I think you always draw this card on the main board, so it refers to the green Adventure deck and the relative discard pile. There's no text that suggest this applies simultaneously to all decks.
2) is the eagle king or the boss from the dangeon in night gain 1 more stranght??
The bonus is applied to the attack score of creatures. A creature is any encounter (other than a character) that attacks with Strength or Craft. This may include Enemy cards and also Events, Strangers, Places, Spells, and board spaces.
3)if some one give me a spell that became may follower, can I use special ability, spell or object to get rid of it???
From the updated FAQ:
Cards That Become Followers
Some cards and special abilities allow characters to take cards as Followers even if the card type is not actually listed as a
Follower. For example, the Minstrel’s special ability allows him to charm Animals into joining him as Followers. A character
that has these Followers in his play area treats them as normal Followers in all regards, except he cannot choose
to ditch them. If another character has an ability that affects Followers, he cannot target a card that has become a Follower.
Example: A character cannot cast Mesmerism to take one of the Minstrel’s charmed Animals because it is only considered
a Follower to the Minstrel.
If a character is forced to ditch or leave a card that has become a Follower (such as the Cell space in the Dungeon, getting turned into a Toad, or because the character is killed), the Follower must be discarded instead.
You can use your own abilities (e.g. Vampiress ability), Spells (if any) and Objects (e.g. Book of Diablerie) to get rid of a Spell that's become a Follower to you. You can also lose it to the Chasm or Vampire Tower.