can someone explain me how work the "discard"

[blackovanossar]

I don't understand how discard is supposed to be played. can someone explain me how it work?

[Tiggy]

Take a look at Dieci Rodion's S3.

[On Use] Discard 2 Skills of the lowest ranks in all of this unit's Skill Slots.

Let's say Rodion currently has this lineup of skills:

S1
S2
S3 (You are using this skill to clash).

When the S3 discard activates, it'll get rid of S1 and S2 and redraw two new skills to replace it.

Additionally if Rodion has multiple actions in a turn, e.g. looking something like this:

S1a S1b
S2a S3b
S3a S2b

Then if you use S3a and S2b, S3a will discard S1a and S1b while S2b will discard S2a.
Then you also have skills that "Do blabla if discarded". In this case, S1a, S1b and S2a will activate their On Discard effects.

[David Bowie Sensei]

So the way discarding works is when you pick a skill, you leave behind the choice you didn't pick. Normally you can use this skill next turn. Discard will get rid of that skill you didn't pick, while gaining any effects that care for discarding.
When it states rank it means your skill list from left to right. So your skill that has 3 lots of is the lowest rank while the skill you have only 1 of is ranked the highest. For Dieci Rodion this means lowest is 1 and highest being 3.

Now the statements of discard in all the units skill slots, means it will try finding lowest ranked skil you left behind working from left to right and discard it.