Larva is probably the single best helminth ability for Protea because Blaze Artillery is absolutely devastating for grouped-up enemies. You want close to max range to overcome the nerfed range on helminth Larva and make it actually usable. High duration means that you don't have to cast Grenade Fan as often, it makes sure that Dispensary stays on the field long enough to maximise your energy return, and it give [Blaze] Artillery enough time to ramp up its combo counter. [Equilibrium] is meant to combo with Synth Fibre on your companion to allow you to use the enhanced health orbs from Dispensary for energy, which lets you spam abilities even with 45% efficiency.