DS is a standalone support hero. He can has many various builds. I present you my hero-killer standalone build
Skills:
1.Wave
2.Hide
3.Wave
4.entangle
5.Wave
6.Cloud
7.Wave
then max ent, ulti, hide and ofc bonus

Items:
1.Ring of the Teacher
2.Steamboots (early game int, midgame str)
3.Astrolabe
4.Hellflower
5.Shield Breaker
6.this item is optional, it can be Frostfield Plate or Sheepstick, depends on enemies

Use Wave mostly to kill heroes, while surrounded by creeps. The more creeps, the more dmg is : >
Entangle is good slow-dps skill, use to slowdown, and finish by wave
Use Hide when u are in danger, and u already used healing from wave and astrolabe

Why my build doesnt contain staff of the master to upgrade ulti? 3rd lvl ulti reduces armor by 24 after 24 seconds. With shield breaker u make it -30
and none of heroes can stand it : > Here upgrading ulti is waste of money.
Enjoy and feel free to comment