well, as most ppl know dervishes are built around enchantments, and alot of thought needs to go into each enchantment picked for a specific, build. they should compliment each other, add conditions, or provide defense/healing. 1 important thing to remember is how u stack them.. knowing which is the most important enchantment must be applied 1st, so that others cover it, thus making it harder to be stripped.
another important point while attacking is to make sure vs melee, and casters if possible, is to ball them up. the scythe is able to hit 3 foes at a time, providing enormous healing from sks such as mystic vigor. even with low armour, mystic vigor combined with regen can provide a pretty gd tank, hitting 3 targets can give u the healing needed to keep going.
a pretty smiple tip but key in any build is mysticism. u must hit the break points needed for the energy gain, and any excess points should be dumped into other attributes, or otherwise are pretty much wasted.
gl and i hope this helps, dan

*hint hint*