This is the last level of the prologue. Your team is facing Cia's army head on. Any current characters might be useful but it would be worth it using Lana for the first time.
Looking for the boomerang
Considering that you know the drill, take down any available bases and checkpoint guards to slow them down. Wait until the north-east base is open. Make sure to collect the boomerang because it's the only thing to take down the moving vines.
Another giant monster?!
Cia will launch another monster on the battlefield. If you remember "Ocarina of Time" and perhaps "The Windwaker" as well. The idea is to wait until the deku heads come out. Make sure to use the boomerang on all heads because taking on one or two would delay the time you reach the weak point. Also at some point, the monster will separate itself and so just find the real monster and do it all again to defeat it.
World's colliding
Now go to Cia's base and go at her completely, attacking her until her health points drained. There would be a cutscene showing that Cia disappeared and the group splitting up into the three worlds. Veterans should know those games in their respective consoles. Impa and Sheik would go to "Ocarina of Time", first released on Nintendo 64. Lana would go to "Twilight Princess", last game on Nintendo Gamecube and first released on Nintendo Wii. Link himself would go to "Skyward Sword", released only on Nintendo Wii.