Sentence:  In ancient times runesters were a specialized class separate from that of the witch or ordinary spell caster (much as the other specialists such as the <WSD>leech</WSD> or healer and the seithkona were different from a witch), and even today many believe it takes years of training to become adept at using the runes in spell work. 
Meaning of the word marked with <WSD> tags:  A healer.