The dream synthesizer did not seem to exist: a wavetable synthesizer with a truly high-quality sound, visual and creative workflow-oriented interface to make creating and altering sounds fun instead of tedious, and the ability to “go deep” when desired - to create / import / edit / morph wavetables, and manipulate these on playback in real-time.
Serum will let you stack a single oscillator to use up to 16 voices. Each of the wavetable oscillators have a number of unison advanced parameters. Stack settings allow for note (e.g. octave) layering to get a fuller sound for a single note-press. Set the unison voices to all have their unique waveform at once with the Unison WT Pos setting, or have them all skewed in a different way with the unison Warp control. A variety of unison tuning modes per-oscillator let you get the stack sound blooming or swarming like you want.