BIGWIGS has the function that indicate Activate boss countdown
but i cant find the function in dbm

I added missing timer for everbloom. and so far I only know of one missing from rise/fall, can you tell me what other one is?

DBM has timers for
Tyr, iridikron, battlefield

it's missing manifested timeways (on my list to fix). that's it. I even checked littlewigs and the only one they have that I don't is one I'm already aware of, manifested timeways.

I'm not sure what you mean by active boss countdown?
You can enable a countdown on any timer. a pull countdown. there is a timer for boss respawn.

most of the missing timers for rise and fall were added not long ago to dbm dungeons.
Didn't realize anyone wanted another timer for last boss of everbloom. the wall/portal is mainly only one people showed interest in.
Far as I know only 2 timers still missing from rise/fall and that's honestly just that it's been difficult getting any logs for it (and any time I run it I'm tanking a 20 so I'm focused on not wiping and forget to log it)

DBM has
oakheart
Tyr
battlefield
yalnu
and ozumat

I'm unaware of sol needing anything, she's attackable instantly when the 3 trash mobs channeling on her die.
I'm also unaware of morchie needing anything and I know lw doesn't have anything for her either.

So all that's missing from that list is manifested timeways, which I'll try to get soon™

Oh, I realize the issue here might be that some of these don't work in language you're playing. ozumat need translations.

but battlefield and tyr and oakheart should work without translations