Fire Emblem Heroes always has multiple summoning banners running, and in each banner, your first summon is free.
I know that in each round, when you summon non-5* heroes, the pity timer builds so that in the next round you increase your odds of summoning a 5* hero.
I'm wondering if each banner has its own pity timer, meaning I have to keep spending orbs within that same banner for increased odds of getting a 5* hero?
Example, pulling 2 rounds of 3* heroes will build the pity timer so I get increased odds of pulling a 5* within the same banner, but the pity timer starts from scratch if I invest into a different banner.
Or is it a global pity timer, in that any round I do will increase the odds of me getting a 5* in the next round in ANY banner?
Example, I put orbs in Banner 1, but only get 3* units. Then I put orbs into Banner 2, and now I have increased chance of summoning 5* in Banner 2 because my last round in Banner 1 was garbage?
I'm just not sure if I should keep summoning within a banner until I get a 5*, or if I can just switch any time I want and still have the pity timer be valid.
Or have I misunderstood how pity timers work fundamentally?