Vynthra's sustainability and durability make her army compositions less rigid, so you can mix and match her roster:
Reavers are tanks; Mandragoras are brawlers
Stingers provide expendable frontline DPS; Arkanids provide free DPS and shielding
Lashers are the primary ranged DPS
Weavers sustain the army, spawn free Arkanids, and assist with anti-air
Behemoths and Harbingers provide additional ground DPS
Rush a Mandragora as your first unit. Build research structures and tech buildings before focusing on a large army, and queue upgrades in the order that you add units to your army so they are ready for deployment.
Every composition can benefit from 30 Stingers for extra DPS and damage absorption.
Mandragora – Weaver – Lasher – Harbinger* – Behemoth*
Start with a Mandragora
Expand to 6 Weavers and 2–4 Mandragoras
Add 10 Lashers for extra DPS
Expand to 8–10 Weavers later
Add units whenever resources allow
Optionally add 4–5 Harbingers if you can manage their ability micro or need more anti-heavy damage
Optionally add 3–5 Behemoths for extra damage and anti-heavy coverage
Excels against ground-based threats
Works from level 1 by substituting more Stingers for unavailable units
Reaver – Mandragora – Weaver – Lasher – Behemoth*
Durable, straightforward, and less APM-intensive
Start with a Mandragora
Expand to 6 Weavers, 3 Reavers, and 2–4 Mandragoras
Add units whenever resources allow
Add 10 Lashers for extra DPS
Optionally add 3–5 Behemoths for extra damage
Use Reavers to charge and quickly eliminate major threats
Works well on every mission
Thresher – Behemoth (Transport)
Very niche siege composition
Infused units cost more transport capacity
2 infused Threshers do not fit inside one Behemoth