User blog comment:SpiderEdy/Opinions of people wanting the Cthulhu Boss/@comment-6218837-20140402191136

Remember, Red said he didn't want Cthulhu in the game.

But I think, if it were added, a sort of thing where he occurs periodically through the game. Like at these auspicious moments:


 * First Shadow Orb/Pulsating Heart broken - the oceans rise a bit; water monsters can walk on land for a bit
 * Hardmode unlocked - the oceans rise quite a bit, ocean monsters get stronger by a bit, monsters swarm
 * Plantera defeated - the oceans rise a lot, covering a bit of the Purity, all monsters swarm and get quite strong
 * Final boss - I think you should need to combine a Terra Blade, Picksaw, 5 Ectoplasm, 5 Souls of Sight, 5 Souls of Might, 5 Souls of Fright, 5 Souls of Flight, 10 Souls of Night, 10 Souls of Light to get the summoning item. Then? Who knows!