U15: "Where'd all my warframe ability mods go?" An explanation.

This is for the folks going "Hey, where's all my abilities?" or "Anyone notice that all the ability mods are gone?" or somthing similar.
In short:
Ability mods have been removed from the game. Warframes now have abilities integrated. You need to level up a frame to gain abilities and use those abilities to upgrade the abilities.

Need more details? Read this here guide!

So, where's my ability mods?

Basically:
Ability mods have been removed from the game. Warframes now have abilities integrated. You need to level up a frame to gain abilities and use those abilities to upgrade the abilities.

Wait, what?

Ability mods are no longer in the drop tables. They have been converted into fusion cores. I am unsure of which mods became what cores.

Warframes now have their abilites always available. However, these abilities must be unlocked by increasing the warframe's rank.

Abilities can be upgraded by using them in missions.

Warframes that had abilities upgraded before the update will still have those upgrades now.

I am unsure if frames created before U15 that did not have all abilities unlocked will have all abilities, though they likely won't.

So, my ability mods just up and became cores? Is that it?

With the removal of ability mods, warframes have now lost 2 ability slots. Any forma that was in those slots have been refuded, though I am unsure if must re-level to access those polarity slots again.

Orly?

Yarly. From the forums https://forums.warframe.com/index.php?/topic/328727-warframe-archwing/ :

"Ability Mod Changes:
https://forums.warframe.com/index.php?/topic/325551-warframe-ability-mods-coming-changes/

The former 4 Ability Slots have undergone the following changes:
All Warframes have had 2 Ability Slots removed. Any Forma spent on these slots will be refunded.
All Warframes have had 2 previous Ability Slots converted to be blank polarities (unless otherwise Polarized).
All Warframes purchased or crafted moving forward will have their abilities automatically viewable in the Arsenal.
Abilities are all unlocked as a Warframe is levelled up.
Abilities are all ranked up as a Warframe is levelled up.

On Login, the following will occur for all accounts:
All highest Rank Ability Mods will be preserved and duplicated to fit the new Ability system. This means you won’t need to rank up any abilities if you already had a Maxed (or partially fused) Ability Mod.
Two slots will be removed (prefers ability polarity) and Forma used on Ability slots will be refunded.
All Ability Mods converted to Fusion Cores of the appropriate level."

Closing sequence

Thank you for reading my guide and I hope it helped!

If you spot a strange grammatical mistake that you feel should be changed or think I can improve this guide in some way, please comment and let me know, as this is my first guide.

I may or may not turn this into/make a guide for all the fancy U15 stuff.