Since the demo I have been theorycrafting builds for myself - here is one for Warden.
Fortress mod does not show in the stats screen.

PROS:
- very high health regen
- high armor constant 60-75 physical damage reduction without Golem skill.
- high Resistances while killing groups of mobs.
- 2 free class points
- high dps with right mods (section Mods)
- can reach 150-250% extra weapon damage easily below level 20
- bonus damage based on health regen
CONS:
- slow start till Anomaly in the Veins third skill
- only 1 free skill slot to match your style
- constantly in the face of enemies due to close range bonuses
- not the highest armor for a warden
- depending on your build can lack party bonuses

MY BUILD


Milestones reached at 5,8, 11, 16 and 18 class points.

I First weapon:

1. Healing weapon - Weapon with high rate of fire - assault weapon with Health Regen.
https://outriders.fandom.com/wiki/Essence_Thief at the beginning

2. Healing weapon variant 2 - an assault weapon with
https://outriders.fandom.com/wiki/Striga
and
https://outriders.fandom.com/wiki/Critical_Point.

3. Group Killing weapon - GRIM MARROW with Bone Shrapnel instead of ASH

4. Automatic Shotgun with Bone Shrapnel and Singulairty mod from GRIM MARROW. It shreds groups.

II Second weapon - a high single target damage one:

1. Standard pump action or narrow automatic with Clip roller and critical chance.
2. Assault rifle tactical variant with Stormwhip and anomaly explosion.

SIDEARM
Can combine two functions - be a group trash killing weapon and healing weapon. Passive life leech is needed, mod at least one AoE mod is needed like String of Gauss or Singularity or Bone Shrapnel.

Gravity Leap variant - accessible at level 7. Good early game especially for single target damage, mostly overheals you. IMHO tremor variant is better. Great mobility skill.

https://outriders.fandom.com/wiki/Auto_Reflect
This mod shreds shotgunners or minigunners.
https://outriders.fandom.com/wiki/Bullet_Acceleration
This mod shreds shotgunners or minigunners.
https://outriders.fandom.com/wiki/Extra_Time
Further utility for our autodamage skill.
https://outriders.fandom.com/wiki/Golem_Of_Death
https://outriders.fandom.com/wiki/Human_Comet
Increase in damage means greater synergy with Life Absorption.
https://outriders.fandom.com/wiki/Life_Absorption
https://outriders.fandom.com/wiki/Perseverance

Tremor variant - has muuuuch more synergy with CYCLE weapon mod(next section). Damage is dealt over time such as heal. This skill setup lacks mobility skill.
https://outriders.fandom.com/wiki/Auto_Reflect
https://outriders.fandom.com/wiki/Bullet_Acceleration
https://outriders.fandom.com/wiki/Extra_Time
https://outriders.fandom.com/wiki/Golem_Of_Death
https://outriders.fandom.com/wiki/Perseverance
https://outriders.fandom.com/wiki/Crush_Sequence
More time with active buff means more damage increase from Cycle weapon mod.
https://outriders.fandom.com/wiki/Give_Me_More
More time with active buff means more damage increase from Cycle weapon mod.
https://outriders.fandom.com/wiki/Human_Fortress
Health regen increases our damage.

These are basics mods, all other mods are only boosters that further enhance your playstyle. For passives stack Health/Firepower in mix proportions (3 health pieces, 2 firepower), Close Range Damage, Cooldown Reduction and Healing Received.

Another must have mod is:
https://outriders.fandom.com/wiki/The_Cycle
This is a must. It grants increasing flat weapon damage buff according to your health regen - for me it is 30% weapon damage increase and 70-80% total flat weapon damage increase after Tremor health regen effect. There is a sweetspot for regen and additional damage, but for now I cant figure it out. The value somehow decreases after certain threshold of healing per second, I thought it would be constantly increasing - overall it is still a solid damage boost.

Build will be updated with the character development. Feel free to post your tips or insights on Warden play in the comments. I will paste them in this section.

1. Weapon leech passive on weapon will free your weapon mod slots. Around 10% weapon leech is all you need.
2. Killing enemies in close range can buff your armor tremendously due to Hierloom Armor.
.