In a Nutshell:
The Megashark is a powerful upgrade to the Minishark which can be obtained as soon as the Destroyer is defeated. It's an exceptional gun and can carry a player all the way to right before Moon Lord if combined with Ichor.
If you use ranged weapons in Terraria, you will have undoubtedly come across a gun called the Minishark. It's the peak of the base concept of ranged weaponry, fast shooting and no looking back. However it's very weak compared to other guns, especially in Hardmode. So it's time to give it an upgrade. It's time to make the mini a mega.
The Megashark is a Hardmode upgrade to the Minishark so you’ll first need to get your hands on that. Getting a Minishark will take a little bit of work. It's bought from the Arms Dealer NPC early on but costs 35 Gold Coins which is a tall order for pre-Hardmode. Waiting until Hardmode to buy it will be easier as Hardmode enemies drop far more money.
Next we need to make this Minishark more shark-y. This means we need to collect five Shark Fins. These are found by killing Sharks in the Ocean biome. They’re relatively rare but not too much so you should have five pretty quickly.
Of course, a gun this good has to be illegal, meaning you’ll need to buy some Illegal Gun Parts off the Arms Dealer NPC. He only stocks them at night to keep things quiet so give him a midnight visit to grab these parts.
Finally, we need the item that really makes this mega. Souls of Might. These are hard to get and drop from the Destroyer boss which can be summoned using a Mechanical Worm. It's a tough fight but if you have a piercing weapon it will be made much easier.
Once it's all collected, take your Minishark, 5 Shark Fins, 1 Illegal Gun Parts, and 20 Souls of Might to a Mythril or Orichalcum Anvil and craft your Megashark.
Now that you have your nautical firearm, you have to use it well. Due to its high fire rate and incredible accuracy, the Megashark can be used effectively with any bullet type so pick your favorite. And don't worry about running out either as it has a 50% chance to not consume ammo when firing.
With good armor and Ichor bullets, which reduce enemy defenses, the Megashark can take you all the way up to the Martian Madness event with little difficulty.
The Megashark works well with high damage bullets since it has a moderate base damage compared to other guns. Though it does also work well with Crystal Bullets, with the many projectiles making up for the low damage.
There’s a few strategies but the best one involves the Super Star Shooter gun and its best shown rather than told.
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