PlugY for Diablo II allows you to reset skills and stats, transfer items between characters in singleplayer, obtain all ladder runewords and do all Uberquests while offline. It is the only way to do all of the above. Please use it.
Supporting big shoulderpads and flashy armor since 2004.
And the armor is there because back in the WotA trilogy Deathwing was under the influence of Demon Soul + Old Gods thus making him immense in power, the armor is made by goblins and are put on so he doesn't fall apart.