Silverthornne, Almsivi Intervention has been a great choice in my majika also. Ive used it so many times and escaped many a threat. No problem casting it underwater either!
A great mapping tip is to wonder the outdoors by the many means of travel- by boat, siltstrider, or teleport, and cast it upon arrival. Run back to where you came from. Take the means to a different place. You should be able to map a vast portion of the island in a short amount of time!
*\Conan/*
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