How to summon and defeat the Twins in Terraria

The Twins in Terraria are playing out the Eye of Cthulhu’s evil twin fantasy. The Twins are the more difficult Hardmode version of Eye of Cthulhu.

Terraria - The Twins Boss Guide

The Twins - Official Terraria Wiki

What armor, swords, spell books, and summoners do I need to defeat The Twins in Terraria? I do put up a good fight, but I still can't surpass them. - Quora

PC - A walkthrough to the Summoner class, for dummies (before Journey's End hits)

Steam Community :: Guide :: How To Summon And Defeat Mechdusa

All Terraria bosses list in order

How To Summon And Defeat Mechdusa In Terraria

What happened to the Twins? : r/Terraria

Mechanical Eye, Terraria Wiki