Partly updated for Enshrouded 1.0— 1.0: the unlock cost; the rest is pre-1.0 wiki data

Swiftshot Sustenance
The pre-1.0 wiki text for this skill gives numbers the 1.0 files changed, so it is not shown; the 1.0 values are above.
Where Swiftshot Sustenance sits on the 1.0 tree
In the Ranger area. The cheapest way in from a starting point buys 4 nodes for 4 points, this one included (one rank each).
- 1Endurance1p
- 2Runner1p
- 3Endurance1p
- 4Swiftshot Sustenance1p
Builds that use Swiftshot Sustenance
2 preset builds tagged SWIFTSHOT_SUSTENANCE — defining picks first, then ranked by tier (S → A → B).
- Ranger SniperRanger
Bow damage and crits: Marksman, Sniper and Skill Shot at full rank, Bow Specialization for the bow's special ability, Fatal Precision and Vitality Surge to keep the crits paying.
- Multi-Shot BowmasterRanger
Volleys: Multi Shot with Spread and Trigger, Marksman and Ranger at full rank, Barrage and Rebound. Ricochets and Rebound II are not on the 1.0 tree.
Related Ranger skills
Same archetype — likely candidates to slot next to Swiftshot Sustenance in a build.
Airborne1pValues in the 1.0 files: 12% per rank, 3 ranks.
Arachnoid1pValues in the 1.0 files: 20% per rank, 3 ranks.
Backstab Mastery1pValues in the 1.0 files: 20% per rank, 3 ranks.
Blessed Arrows1pValues in the 1.0 files: 8 per rank, 3 ranks.
Counter Battery1pValues in the 1.0 files: 8% per rank, 3 ranks.
Dexterity1pIncreases your Dexterity attribute by 1 Increases Bow and Dagger damage by 5% per Attribute Point
Eagles Bane1pDamage against flying enemies increased by 30%.
Endurance1pIncreases your Endurance attribute by 1 Increases Stamina by 10 per Attribute Point
Sources: game files 1.0 + Keen Games 1.0 patch notes (changelog, combat changes) for the unlock cost; enshrouded.wiki.gg (pre-1.0) for the description and effects.