It's pretty evident in the mix, Steve Void adds in this gorgeous detuned pluck, but I can't quite figure out how he makes it. If it helps I primarily use Massive and Serum.
https://soundcloud.com/thefallingapple/nik-ernst-stronger-steve-void-edit

It's surprisingly simple: 1x VA Sawtooth -> Lowpass Filter with Filter Env (150ms Attack, 450ms Decay).

Using Serum:
OSC A
    -Single smooth sawtooth wave (Analog -> MB Saw)
        -Unison 1
FILTER
    -MG Low 24
    -Cutoff 106hz
    -Res 7 %
    -Map Env 2 to Cutoff
        -36%
ENV 2
    -182ms Attack
        -45% Curve
    -446ms Decay
        -67% Curve,
    -Sustain 0%
    -446ms Release

Play around with Filter Cutoff and ENV 2 Amount. The key here is the attack on ENV 2.

No problem, glad I could help!