These are NOT sources for status immunity in general but ONLY for AoE weapons usage. So, if a source provides status immunity (ex. Atlas's Rumbled Augment) but you can't use weapons then it's not listed.
Rhino (Iron Skin)
Nezha (Warding Halo)
Gauss (Kinetic Plating)
Revenant (Mesmer Skin)
Oberon (Hallowed Ground)
Nidus (Parasitic Link)
Harrow (Covenant, *Invulnerability phase)
Inaros (Negation Swarm Augment)
Nekros (Shield of Shadows Augment)
Frost (Icy Avalanche Augment)
Ivara (Empowered Quiver Augment)
Nyx (Assimilate Augment)
Ember (Purifying Flames Augment, 4sec Immunity)
Hydroid (Tidal Impunity Augment, 12sec immunity)
Wyrm (Negate Augment *once every 5sec)
Oberon (Hallowed Ground *30sec cooldown)
Ancient Healer (Immunity to stagger within aura range)
Sure Footed (60%)
Primed Sure Footed (100%)
Cautious Shot (90%)
Power Drift (30%)
Rolling Guard (3sec immunity, 7sec CD at R10)
Motus Set Bonus (100% while airborne)
Constitution (40% faster knockdown recovery)
Pain Threshold (160% faster stagger recovery)
Handspring (160% faster knockdown recovery)
Valkyr (Passive) (50% faster knockdown recovery)
Nezha's Safeguard Augment allows for Warding Halo to be cast on others.
Valkyr's Passive, 50% faster knockdown recovery, stacks with Handspring and Constitution for up to 250% faster recovery speed.
PS. If I forgot something, please reply and I'll update the post.