Step 1: Get to the Icecrown Citadel instance, which is located at the stairs West of the Wrathgate in Icecrown.
Step 2: You need to defeat all the bosses of each of the wings (Saurfang, Sindragosa, Professor Putricide, Blood Queen Lana'thel) to activate the teleporter.
Step 3: The teleporter in the middle of the instance (between the entrances of each wing, suspended from chains and with Val'kyr flying around it) leads to the Frozen Throne.
Note that in order to be able to attack the Lich King in hard mode, you need to also have defeated each of the wing's End bosses on hard mode.
The way you get to Sindragosa in Icecrown Citadel is by defeating all the bosses on each of the wings. This will activate the teleporter which you need to get Sindragosa.
Fall of the Lich King, patch 3.3 has introduced the Icecrown Citadel raid instance, with the Lich King as its final boss.
In "order", they are:Lord MarrowgarLady DeathwhisperGunship BattleDeathbringer SaurfangFestergutRotfaceProfessor PutricideThe Blood PrincesBlood-Queen LanathelValithria DreamwalkerSindragosaThe Lich King
The Lich King is a Boss (Level 83 in stats) who is the last boss in Icecrown Citadel, a 10- and 25man raid instance introduced in patch 3.3 of Wrath of the Lich King. He is not Neutral, but will not attack unless the event is started by speaking with Tirion Fordring.
Tier 9 armor is sold in Dalaran. It is associated with the Crusader's Colisseum. It is assigned to get a player ready to fight the Lich King at the Icecrown Citadel.
The lich king (Arthas Menethil) is a former Paladin the prince of the humans then he becomes a Death knight who kills his father, King terenas menethil. And becomes the Lich King, the guy who rules over the scourge and then went and killed a load of people.
Yes. The power he used to create death knights isn't hard linked to him as you might be presuming. This is evident when he loses control over his death knights and he doesn't simply cause them to 'shut down' per se.
Ten days
Icecrown is the Northern-most part of the continent of Northrend, named after being a "crown of ice on the world". It is the home base of the Scourge, currently under invasion of the combined forces of Horde, Alliance, Argent Crusade and Ebon Blade. Until the invasion, Icecrown Glacier was sealed off by a large gate, Angrathar the Wrath Gate, but airships have made access to the glacier possible, as well as scaling the mountains from the Frost Peaks. The most notable features of Icecrown are the Argent Tournament Grounds in the North-east, and Icecrown Citadel in the South-west. Icecrown Citadel is the heavily fortified stronghold of Arthas, the Lich King. It is guarded by his most powerful minions, and filled to the brim with the dead and reanimated corpses of his enemies. At the heart of the Icecrown Citadel is the Frozen Throne, the giant spike of ice hurled to this world containing the spirit of Ner'zhul the Shaman before he merged with Arthas Menethil.
Technically, Arthas became the Lich King, and currently people can fight the Lich King in Ice Crown Citadel, he is the final boss in this raid.
All four versions of Icecrown Citadel have been finished. ICC25 HC has only recently been completed by a guild on Lightning's Blade called Paragon.
There are two shields of note which drop in Icecrown Citadel. The Icecrown Glacial Wall, which drops from 25man Blood Queen; and Neverending Winter, which drops from the 10man Gunship event. Both are also available in heroic versions. The Icecrown Glacial Wall has Block Value on it, which while useful, is still depreciated in ICC compared to Parry and Dodge. Its stats are much better than Neverending Winter, so that makes up for that itemization.
Technically the Horde and Alliance both formed an alliance with the Death Knights after the Death Knights where betrayed by the Lich King.