If you can manage to smash the Golem and get lucky by being blessed with a possessed hatchet, you're good to go.
My way of beating the twins is simply a long asphalt road up in the air and equiping wings, the possessed hatchet (max mods are recommended) and turtle armour.
Place a heart statue or two in the middle of the road that drops hearts in a honey pool and just run from one end to the other. Use the wings or a jetpack to avoid being charged.
Also the possessed hatchet is a melee weapon with ranged capability, so equip yourself with accessories that up your melee damage.
Lastly, forgot which item it was (cross necklace?) but there is an accessory that increases your invulnrability time after being hit. For me that one made life alot easier.
[DOUBLEPOST=1446665376,1446664895][/DOUBLEPOST]Incidentally, the setup above also works rather well with a ranged setup and a megashark.
If you need the fins, during a bloodmoon shark spawn is doubled.
Starting from the beach, make a long bridge of platforms that reaches until the end of the screen and (important!!) is submerged by at least 1, preferably 2, tiles.
Under this bridge of platforms, make another bridge that is about 5 tiles lower.
Now run back and forth on the first bridge (or stand still, which ever you prefer) and let the sharks come to you.
A battle potion and (melee) weapon with at least some knockback and range helps to avoid being charged. Also keep in mind sharks might try to attack you from directly below, so a spear is a good weapon of choice.
Finally, you could up the spawn some more by placing some watercandles that are on platforms that are above the water.
Hope that helps you in getting your megashark (and perhaps a diving helmet or two)
