Telain Forest is the fifth area in the Scenario area of the Battle Map, and it is available to players after completing Mt. White Ragon in normal mode. The area is heavily forested, and is inhabited by Monsters of various elements.
This is where the game seems to get a bit harder. You go from hold-your-hand regions of all wind (Kabir Ruins) or all water (Mt. White Ragon) (mostly) to a tough mixture of fire, wind, and water. The horned frogs are surprisingly strong.
In Stage 7, the Boss monster will appear with two underling monsters Inugami (Water) and Warbear (Fire). You may take out the side enemies first, but another strategy is to focus all attacks and destroy only the Chimera. Once the Boss is destroyed the stage will be cleared without having to deal with the underlings.