Dont need skellies!
Decrep and Spear and MANY POTS, and there are usually plenty laying around.
If you use Clay you might get the double slow going and he is also cheap on mana for recast. If ya hit 30 use FG, but dont expect him to live the whole time, D isnt stupid he uses that cold attack on Golems a lot!
Remember, D cant go in the "bottlenecks of CS so pop up a tp there and exit and leave from there for pots.
Figuring out how to Kill D solo at sub 30 with all builds is good clean fun and very doable!