Glimstone Grab!

From BoardGameGeek:

A cooperative game for 1-4 players. Much Middling is an average place, except for the special gems (glimstones) in its forest. Children love to play with these but unfortunately, a group of trolls has settled into a glade there. They love the glimstones too and have been snatching the children for lunch. A wizard recruits Esmeralda, from the Hoard game, as he knows of her reputation stealing treasure from a dragon and hopes to put her skills to use to benefit the community. The wizard and Esmeralda set off in opposite directions, collecting glimstones which can be used to ransom snatched children and buy time. When they meet again, if they have the right combination of glimstones, they can perform a spell to banish a troll. They must banish all the trolls to win, but if a player ends their turn and all children have been taken, the players lose. Players use movement cards to move the characters between the gems; it is possible to plan sequences of movements to get the characters to align again. Before each player's turn, an event card reveals if a child has been snatched or other forest inhabitants, some friend and some foe to the players, have been active that turn. -description from the publisher