There aren't really any must have items beyond the hp plat fire rings. FBSS will give you a nice bump in dps and considering you already have a decent ratio weapon there isn't any other combination of gear for the same price that will yield that level of improvement. STR can become an issue (low str = low atk = high miss) in late 40's if soloing even with our self buffs, so that may be something more general to plan for. For grouping though it doesn't really matter because there will generally be someone to buff that and while it is a nice contribution, your primary role is not killing things it's keeping them mad at you ^^
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