crazybirdman says:
Can't advantage be used for a critical? Or threat? (depending on the weapon)
On standard attacks, yes. Weapons have Crit ratings, though. They have a fair, built-in way that says how much Advantage you have to spend to crit. No other checks have that, as that's not a standard result of most other checks.
As discussed above, it's not really practical to approach the actions of Titans like standard attacks, for all of the reasons I enumerated above.
crazybirdman says:
Does the boar not have a standard attack?
Again, what would such an attack look like? I can't stat such a thing in a balanced fashion that doesn't break other dice-logic OR that doesn't just automatically kill you. Does that make sense?
Say I give it a "balanced" 4 or 5 Brawn and 2 Brawl. That would put up a good fight using standard combat mechanics.
Ok, well, next thing that happens is a PC with 4 or 5 Brawn and ranks in Athletics wants to take an Action to push the boar over a cliff, or just wants to hold it down so it can't go anywhere. i.e. they take a non-Attack opposed Skill check against it. Well, we've established the boar only has a functional 4 or 5 Brawn, and so all of the sudden this completely impossible narrative thing has been made possible by this need to for the combat mechanics to be balanced against a PC scale.
I've broken dice-logic.
Or, the alternative to that is I give it stats that it should have, like10 Brawn and 4 Melee, +10 damage, or whatever, and it auto-kills someone every turn. That's not a good way to do it either.
I can't appropriately stat it's attack, because it either breaks the mechanics in other places, or there becomes no way for me to keep you alive.
So, the other way is to do things is as I'm doing them - Narrative Play, focusing on Skill challenges, with narratively appropriate consequences of failure.
crazybirdman says:
Also some things are inherently dangerous right? For example, defusing a bomb, would have a Challenge die just due to the possibility of something
really bad happening.
Yes. But as Eskaton correctly pointed out, the rules as written generally only allow you to assign the Difficulty of the roll based on the narrative challenge. You generally are supposed to only upgrade or modify such checks using Story Points and Setbacks.
But, again, the RAW says upgrades USUALLY only come from Story Points, which does leave the GM latitude to assign upgrades based on the inherent narrative danger, but it just isn't standard practice.
To which, my point of, Titans are not standard challenges, and so may require a little non-standard (but still within RAW) application of the rules.