The Smugglers in Dune: Spice Wars rely on turning their rivals' prosperity into their own. While they might not have the mightiest armies or votes in the Landsraad (at first, anyway), their unique power to skim off of other players' economies helps them keep up and eventually outpace their competitors.
Related: Dune: Spice Wars - How To Manage The Spice Market
Letting other players do the work for you is not without risk, and you'll need to be aware of the political situation on Arrakis at all times. Make yourself indispensable to the Great Houses, then use their own resources to steal the planet out from under them.
The Smugglers' unique ability allows them to construct Underworld Headquarters in other factions' Villages. This requires a decent investment of Solari and a small amount of Authority, but once established an Underworld Headquarters can have exclusive buildings that provide benefits to the Smugglers for as long as they remain in play.
An Underworld Headquarters can have one building for each building in the host Village. Each costs two hundred Solari and takes two days (one minute at normal speed) to construct, but Underworld buildings have no upkeep.
While the Smugglers don't start with votes in the Landsraad, they can pay Solari to place a Bounty on one Resolution at the beginning of each session. Rival factions who vote as directed by the Bounty receive five Solari per vote if it passes.
One way to exploit this is to sell Influence for Solari to other factions just before the vote. With their coffers suddenly emptied, your opponents might consider voting your way with the Influence they just bought. Even if they don't, you'll still have cash from the sale - just don't try this with high-impact
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