The latest Roblox Second Piece update has brought Maki's Weapon, Split Soul Katana, into the game. It is useful to equip if you want to play PvP; however, you will first have to obtain it either through trading or by completing a few tasks.
Since they are quite easy to complete, you can get Maki's Weapon, Split Soul Katana, yourself quickly.
Second Piece Maki Weapon: How To Obtain Split Soul Katana
First of all, you need to go to Shinju Island and wait for an NPC to spawn whom you have to hire. The NPC spawns every 10 minutes and despawns in five minutes, so you won't have to wait much and will have enough time to talk to him.
Once you see him, talk to him and give him Beli to spawn Toji in the same island. Next, kill Toji and there is a chance that he will drop Split Soul Katana. If he doesn't, simply repeat the above process until you get the weapon.