Lanka's Palankasha have MR12 compared to Yomi's 13/14/15 for size 1/2/3 demons.
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Yomi's demons already have 14/15 MR. A spell to increase that would probably make them too strong - 17+ MR seems to be reserved for powerful commanders and elite sacred troops. If Yomi had some decent non-demon troops I don't think banish would be a big issue.