While the Gum/Rubber Fruit is one of the worst Devil Fruits in King Legacy, it turns into one of the better Fruits in the game when you unlock its Gear Fourth – Snake Man. This guide will show you how to obtain Gear Fourth if you already have the Rubber Fruit.
The Feature Image of this post was created by Reddit user u/mad_titan263.
How to obtain Gear Fourth (Snake Man)
Requirements
To start the quest to obtain Snake Man, you must have eaten the Gum Fruit. You must also be Level 1,000+ and have $1,000,000 Beli.
Step 1: Talk to Beauty Girl at War Island

If you meet the above requirements, go to War Island (1750+) in the First Sea and talk to the Beauty Girl NPC. She is located in the same building as the Set Spawn NPC. She will give you a quest to go find Redbird in Sky Island.
Step 2: Talk to Redbird at Sky Island

Head to Sky Island and talk to the Redbird NPC. He is located at the edge of the lower island, behind the 4 Sky Soldier NPCs. Redbird will ask you to find White Man at Desert Island.
Step 3: Talk to White Man at Sand Island

Head to Sand Island and find White Man at the second tower on the left side of the Sand castle's walls. You will have to move around on top of the tower until you fall down to White Man's concealed location. White Man will ask you for $1,000,000 Beli in exchange for Gear Fourth (Snake Man). That's it; you now have acquired Gear Fourth, which requires 1,000 Fruit Stat Points by pressing the B button on your keyboard.
Gear Fourth Moves
Gear Fourth makes the Rubber Fruit much more helpful, but it still can't compete with the best Logia, Zoan, and Paramecia Fruits in the game, both in PvE and PvP. Its damage is pretty good for PvE, though.
B: Fourth
Pressing B will transform your character into Gear Fourth. The Fruit Stat Point requirement for this move is 1,000 Stat Points.
Z: Jet Culverin
The Pistol move of Gear Fourth. The character will stretch their arm to hit the closest Player/Enemy NPC. The move takes 1-1.5s to hit, and the opponent doesn't have to be in your line of sight. Your character will be stationary during the attack unless you can successfully dash out of it (not sure that still works).
X: King Cobra
The Bazooka move of Gear Fourth. It takes longer (around 4-4.5 to complete the attack but deals about double the damage of Jet Culverin. Your character will be stationary during the attack unless you can successfully dash out of it (not sure that still works).
C: Black Mamba
Black Bamba lands 82-86 punches, while you can also move freely when using it. While it can easily break Ken/Observation Haki, it is quite easy to dodge in the first place.
E: Flight
Gum is one of the Fruits that can fly in King Legacy, with a flight speed faster than normal boats.