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Elinks-NPC/classic is a friendly wrapper-template that includes calls to two {{Elinks-NPC}} (second one with the Classic support). The first should contain non-Classic (mostly Cataclysm) ID, and the second one for the removed and Classic-only ID, which directly links to the Classic version on Wowhead.

Usage
{{Elinks-NPC/cr|<Non-Classic ID>|<Classic ID>}}
Example
{{Elinks-NPC/cr|<40554>|<4720>}}
Output
Current Classic