Ohm runes are primarily used for creating
Call To Arms, a powerful runeword. Due to the demand for a +6 to
Battle Orders, it is often rerolled many times. Beyond that, it is used in
Faith (one of the best bows available) and
Exile (the best shield for a Smiter).
Although it sports a whopping 50% Enhanced Damage in weapons, it is rarely used for this as it is generally weaker than a 40% ED 15 IAS jewel ("40/15").
Lo runes also tend to provide a greater damage bonus overall.
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