As Witch how do I win?

[Edi]

shift-c will expose the entire map for view. In CoE2 it is unfortunately sometimes the case that some player starts on a tiny little island off the coast and cannot reach anyone else or be reached by anyone else unless in possession of remote attack spells.

I remember one game where this happened and the only way to kill the enemy was bombard him with horrors until he died (playing shaman, who has that option).