When external elemental effects are done through an Azerai, it can augment the outcome in different ways.

Flame conditions:(doesn't take effect if they are resist or immune)

increase fire damage

Burning: they take a number of d8 of fire damage every turn until they take an action or get doused

Fearful fire: run in random directions and be afraid of the source of fire and run away

flustering lights: stacking dazzled effect, so -1 to attack rolls and perception checks every time they take fire

cloth burning: stacking -1 to ac's until the clothing is mended

fire resistance reduction

fire resistance improvement

Cold conditions:(doesn't take effect if they are resist or immune)

cold core: reduce healing by d12 for every stack until the creature is subjected to fire damage or heat over a short rest

physical ability drain: reduce the stat of str, dex, or con by 2 every time they are hit. goes away in long rest with high heat in the room or greater restoration

limb disfigure: make a con save, on failure one of the limbs get severe cold, hands are multi attack, movement is half speed, hitting it again makes it so that you cant take actions if its arms, or movement is 0 for legs. target needs to take fire damage to regain use of a limb. 

slow movement: slow movements

cold resistance reduction

cold resistance improvement

Lightning conditions:(doesn't take effect if they are resist or immune)

paralyzed: either 1 round with no save, or dex/con save to be paralyzed. they need restoration to get out of it 

chain: deal lightning damage to another creature within 15ft

shocked: cant take reactions, has a minus 2 to dex saves

respiratory failure: after moving more than half their speed they need to make a con save, on a failure they immediately become incapacitated

heightened sensitivity. vulnerability to the next attack

dazzled condition: blinded, and a minus 2 to wisdom saves

lightning resistance reduction

lightning resistance improvement

Sound conditions: (doesn't take effect if they are resist or immune)

mental ability drain: reduce the stat of int, wis or cha by 2 every time they are hit. goes away in long rest with medicine check

winded: str save, the creature cannot move the next turn

Deafened: has a 20% chance of spell failure when casting spells with verbal components. cannot hear.

Knockback: shunt them some number of feet away or knocks them prone

Auditory hallucination: when addressed buy someone verbally, make a wisdom 15 save on a failure you come under the effects of dissonant whispers

Reverb: make a con save, on a failure they gain a minus equal to the damage modifier from the attacker, every turn this minus gets reduced by 1. this minus is applied to attack rolls and skill checks.

thunder resistance reduction

thunder resistance improvement

Earth conditions:(doesn't take effect if they are resist or immune)

Fatigued: stacking -2 penalty to strength and Dex checks and saves. lasts until the

concussed: can't concentrate on spells or concentration effects con save to be able to take actions

Sunken: drop the creature 5 ft into the floor, takes a strength check to break out of the ground, dc15+5 for every 5 ft down

shattered: reduce resistance to bludgeoning 1 level until armor is fixed or magical healing is done. for non magical healing it would take 1d12 long rests

petrified: turn a creature unconcious, need a restoration to undo it

Knockback: shunt them some number of feet away or knocks them prone (athletics check to combat it)

Bullrush: use athletics vs strengh score of creatures in your movement path. any who's stats are under the roll are knocked prone and dealt proficiency bonus of player hit die

physical resistance reduction ( pick one)

physical resistance improvement ( pick one)

physical resistance improvement

white is the original text yellow are my interpretations

Like the ability to use reactions to just say "no" or "not in MY house" to some elemental spells. I'm not sure what it could look like tho! It could be some more fun variation of your homebrewed counterspell except for elemental abilities instead of all spells.

this could be an augment to the missile deflection, and you can spend 2 ki points per person to save (DISCIPLINE)
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Elemental Expulsion; as a reaction reduce incoming elemental damage by a roll of your martial arts die plus wisdom. If you're naturally resilient to the element, you may instead halve the damage.

pretty cool idea probably the same as the above with using ki points per person (DISCIPLINE)

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Elemental Amplifier. As a reaction you may add your martial arts die plus wisdom to elemental attacks in the area.

elemental amplifier: yeah i approve, the drakewarden ranger does this and its pretty powerful (DISCIPLINE)

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Mayhaps, as a reaction you could use your elemental attunement to weave elemental attacks in an area within range past or around a number of creatures equal to your proficiency bonus (maybe provides advantage on saving throws or extends evasion to them?)

AN alternative to water whip, meant to handle aoe spell effects and environmental effects this could be a story reward (DISCIPLINE)
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Maybe you could use your reaction to use elemental attunement for imposing disadvantage on enemy saving throws to elemental effects?

hmmm, reaction to grant disadvantage to saving throws against elemental effects. mmm i'd say veto, but there doesn't look to be elemental effects other than yours so im mixed leaning to no

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Ooh, or if there were attunement items that improved the damage dice of weapons woven from elemental attunement? Or to improve how many earth attunement weapons you could have created and ready for stunning enemies at a time! From balance of nature, you know?

Could be an effect from a Bound Azerai
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What if there were items that gave a trait called "elemental sense," and it was like beast sense but for Azerai?

Yeah totally

What if there were items that gave the ability to use your elemental attunement to "meditate" on the elemental forces around you, gaining a sense for their attitudes, health, behavior or bodies or how many there are like a GPS!

sure, a divine sense but for Azerai

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What if there were items that allowed a monk to use elemental attunement to expend ki points to try casting dominate person on an Azerai at melee range? What if this could possibly lead to a find familiar interaction with the Azerai so long as concentration is maintained?

go for 8 ki points to cast the spell, the find familiar will require a ritual on the part of azerai totem. the azerai totem can bestow buffs on the Azerai based off the make

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What if there were items that allowed more than the usual elemental traits to be taken from a monster or Azerai?

this one is some monster hunter, just taking parts of hte elemental creature and making stuiff with them

It's also hard to say sometimes since it's like...which abilities are gonna be items, which are gonna be subclass features or implied powers?

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What if there was an item that took balance of nature's fire attunement and made it do a double-flare instead of single flare? Or made it as part of an attack action!

we could look at updateing some of them

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Could you carve items that could allow some sort of unique combining of two elemental disciplines that otherwise couldn't be merged together into one action? Like there's this one discipline that allows some sort-of attack the monk can make that blows enemies away with a air+punch, but there's also the fire-snake-fangs discipline that extends reach an does fire damage. So what if it added that fire damage to the air punch so it was like hot steaming air or a whirlwind with flames snaking through it? Or that shocking grasp discipline combines, so now the air punch is also fueled with a thundering storm that takes reactions away!