Death Coil can be used both as a nuke and a heal, just remember that it deals damage to you unless you are using Aphotic Shield or Borrowed Time.

死亡缠绕可以伤害敌人和治疗友军，当你使用无光之盾和回光返照的时候，它不会对你造成伤害。

youdao

See how the 3 enemy heroes are now very poorly positioned; bunched around me, they take high damage from Aphotic Shield, Nether Blast and Life Drain.

看到敌人英雄3现在非常不利的地位，我周围的隆起，他们从无光盾，虚空稻瘟病和生命吸取的高损害。

youdao