Here's the thing about variety: if you gave me a Harrowed Zaouli's Bane with Solar Burn, I would actually use it.
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Just give us an item that costs 100+ legendary marks that we can infuse into the primary of our choice for a random elemental burn. Or instead, 4 items. Random burn costs less, guaranteed burn of your choice costs more. Gives a very good use to legendary marks and makes you have to work for it, as well as choose wisely.