How strong Arthas the Lichking was supposed to be, before they downgraded him in the WotLK Expansion?
And later retcons .
This is about the original unretconned story.
That’s how Ingame Books in WoW Classic described him.
WoW Classic Ingame Book
The Birth of the Lich King
This time, Kil'jaeden could not afford to fail.
Holding Ner'zhul's spirit helpless in stasis, Kil'jaeden gave him one last chance to serve the Legion or suffer eternal torment. Once again, Ner'zhul recklessly agreed to the demon's pact. Ner'zhul's spirit was placed within a specially crafted block of diamond-hard ice gathered from the far reaches of the Twisting Nether. Encased within the frozen cask, Ner'zhul felt his consciousness expand ten thousand-fold. Warped by the demon's chaotic powers, Ner'zhul became a spectral being of unfathomable power.
The Lich King Triumphant
Even weakened as he was, Arthas ultimately outmaneuvered Illidan and reached the Frozen Throne first. Using his runeblade, Frostmourne, Arthas shattered the Lich King's icy prison and thereby released Ner'zhul's enchanted helm and breastplate.
Arthas placed the unimaginably powerful helm on his head and became the new Lich King. Ner'zhul and Arthas' spirits fused into a single mighty being, just as Ner'zhul had always planned. Illidan and his troops were forced to flee back to Outland in disgrace, while Arthas became one of the most powerful entities the world had ever known.
Currently Arthas, the new and immortal Lich King, resides in Northrend; he is rumored to be rebuilding the citadel of Icecrown.
Rules
1.Only Frozen Throne Ending - wow classic Arthas Lichking
2.Nothing after Classic happened (no expansions)
3. Summarize and imagine or think how and who the Lichking would be as described in the vanilla classic ingame book
4. How Arthas would invade Azeroth? Would he succeed?
5. No Cosmic stuff or jailors
6. Arthas as the Lichking is invading Azeroth after wow vanilla (no expansions happened)