It's not a Phantom. It's a Zora Warrior.
There are 2 main ways to beat the thing at that point in the game.
The first is to wait for him to attack, and when he's vulnerable, attack him.
The second way is to use your boomerang to hit him from behind, stunning him long enough for you to get a couple good swings at him.
I prefer the latter, as it is easier and is less likely to get you killed.
Then again, you COULD just listen to Romanos and eat cheese all day.
u dig by the clostest palm tree near the cave
walk in...
Wayfarers cave on Molidia Island
behind a wall in the western part of the cave.
Use the shovel. You get it on Molidia Island inside the Wayfarers cave.
you go to the island below the fog and find a map in a cave that tells you how
there are palm trees on the top of the island (excludes cave) dig under them
u write 7 on the little thing next to the door
Just go to a cave right of Oshu's house, writ the number 7 and you will have the sword.
Its in the cave behind the hut. win the fishman and get troubh the small passage. then trow damaged wall with bomb.
I think it was somewhere near a cave you probably know where it is the place where there is a door with a sun symbol on it where the arrow shooting game is
go in the house and talk to the kid then he will get mad then try going out the door then he will yell for you then talk to him again then you will be able to go in the cave