So, new level cap will bring new Tier 4 ability mat, which can be obtainable only once per each day by completing all Daily Rewards, and only if you're Lvl.80.
I'll wait with my opinion to moment when devs will reveal how many of them will be needed for upgrading.
Desc.: A rare material used to upgrade character abilities beyond Level 70. This can only be obtained at Level 80 every day by completing all Daily Activities.
Name: Ability Material Omega
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But it makes no sense thatm it's only available at 80, since most basic abilities upgrade at level 76.
And the abilities lvl 76+ Need this material
5 days to collect.
3 days extra wait to reach 80 first.
Not a big deal.
Why? Eventually you will have some extras but only just getting a character to 74 or 76, at which point you can upgrade.
Occasionally you get them for completing the final node in GW, even at lower levels. You get one a day for completing all your daily rewards at level 80 and above I think. It also shows up sometimes in the final tier of the ability mats challenge.
You use them from putting abilities from rank 7 to 8. I think it is 5 per ability, with 3 for leadership abilities. It varies on the character, but it isn't until about the mid 70s that you can begin using them I think.