Upgraded item requirements: has anyone

[adeyke]

Only realms characters can be ladder characters because in SP, there's no concept of ladder. However, for purposes of the items and recipes, it has the same things enabled as the ladder games.

Here's a quote from Unique Item Basics:

(Ladder Only)
This item can only be found by Battle.net Ladder Character as well as Single Player, TCP/IP, and Open Battle.net Characters. It will not be found by Normal Battle.net Realm Characters.