Mario + Rabbids Sparks of Hope: Come Rain or Shine – Quest Walkthrough

Enter the Lighthouse

Exit the Temple Catacombs of the Sunrise Temple to the northwest. Climb up the ladder and enter a small room at the back. Make sure you also pick up the Planet Coin in the first room:
-> Grab and move the box to the right.
-> Open the container.

Then take the ladder up and exit the house through the front door. Now you’re back in the center of Beacon Beach Town. The Lighthouse is to the north, so let’s go there.

Enter the lighthouse. You’ll also get a new Spark called Aquanox here.

Defeat the Guard

Inside the lighthouse, at ground level, an enemy is defending an egg. Defeat him in a fight, dash through the egg, pick it up, and throw it at the tentacle to destroy it.

Reach the Top of the Lighthouse

Take the staircase up. On this floor, there is a blue shining platform that makes the tentacle to the left disappear when you stand on it. Just move the nearby box onto this platform. You will see how to move it. There are markings on the floor.

Now you can pick up the yellow cube behind the blue tentacle and put it inside the device near the staircase up.

Now you can go up the stairs and defeat the guard there. Then dash through the egg, pick it up, and throw it at the tentacle. Pull the box onto the glowing platform to open up the last bit of the staircase.

Head upstairs, exit the lighthouse, and defeat the Darkness Tentacle to finish this quest.

Reward:
Purified Darkmess Energy Crystal

You can now either go to the next planet or continue with the Side Quests at Beacon Beach.