Best path on the Devotion Tree for a Demolitionist?

[Invghost]

Just wondering, which would be the ideal path to head down? I'm planning just to keep spamming grenades (Grenado) with this character, so I'd like to go down as many paths that revolve around reduced cooldown times.

[Knightmare]

There is Aldanars Vanity ( legendary off hand) which can reset cooldowns on skills. Ulzuin chosen skill does that as well. You can try out devotion called Ulzuin Torch which has a chance to throw Meteor on your attacks and bind it to grenado.Arcanist tree has cooldown reduction passive as well

[Halcyon]

Check out the devotion page on grimcalc.com it's not a perfect representation so cross-reference it with the game for some bonuses that don't show up.