u/MageToasty

My Friend is currenlty building a Revenant Polder Summoner.

At the point of choosing the ancestry we kinda struggle to find a rule that explains if the damage immunity of the Ancestry Trait of the Polder stacks with the Signature Ability of the Revenant:
Corruption Immunity: Your innate shadow magic grants you resilience against the unnatural. You have corruption immunity equal to your level + 2.

Signature Trait: Tough But Withered: Your undead body grants you immunity to cold, corruption, lightning, and poison damage equal to your level, but you have fire weakness 5.

So my Question boils down to if both effects work together to increase the damage immunity to 4 or does the Polder Trait take priority and it stays at 3?

The Rule for damage immunity states if i have two different types that could apply, the more potent one applies, but there is nothing for stacking effects.
Damage immunity means that a creature can ignore some or all of the damage they would usually take from certain attacks or effects.

If multiple damage immunities apply to a source of damage, only the immunity with the highest value applies. For instance, a creature with damage immunity 5 and fire immunity 10 who takes 12 fire damage reduces the damage by 10 points.

Im a 1L Hakaan Metakinectic Null with the Forceful Ancestry Trait.

Forceful Trait: +1 distance on push,pull and slides

Am I considered a larger Creature in regards to the Big versus Little rule. So that my Push is increased by 1?
Big versus Little:

When a larger creature force moves a smaller target with a melee weapon ability, the distance of the forced movement is increased by 1. If a smaller creature force moves a larger target with a melee weapon ability, the distance doesn't change.

And the Metakinetic Mastery with 2 Discipline for another 2 from my Intuition score.

Metakinetic Mastery:

Discipline 2:
Whenever you use the Knockback maneuver, the forced movement distance gains a bonus equal to your Intuition score.

So the worst I can do on a Knockback Maneuver is Push 5 on a Tier 1 result correct?

Do I get to slide every enemy in my Aura 1 Null Field if I damage them with a squad unto myself the 5 cost Heroic Ability?

Null field ability for 1 Discipline reads:
Gravitic Disruption: The first time on a turn that a target takes damage, you can slide them up to 2 squares.

Heroic Ability:
📏 2 burst
🎯 Each enemy in the area

Power Roll + Agility:
≤11: 6 damage
12-16: 9 damage
17+: 13 damage
Effect: You can take the Disengage move action as a free maneuver before or after you use this ability.

As I understand it, I get to slide every enemy that is adjacent to me as my Null Field is Aura 1. But still feels a bit strong. And Do I get to slide them for free in my allies turn too?