I'm not sure if you can choose Haunted Forest.
The rule says
"If the Scenario you are playing has the Haunted Terrain special rule, all the forces on the battlefield are Haunted Forests. Use the rules listed below instead of rolling on the Mysterious Forest table in the Warhammer Rulebook as soon as a unit enters (or deploys in) the forest."
The Ambush from the Worldroots (free woods), says you place a forest, which is not mysterious terrain, you declare it's type.
The Acorns of the Ages say to choose from the types on the Mysterious Forest table. Haunted Forests aren't on the table.
It might be possible with the free worlds, but it isn't with the Acorn.
|