#or even in general if there are rumours about a dangerous beast in Mircea

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@zeroabyss replied to your post “@zeroabyss replied to your post “Since I'm...”:

Yes dead. Rhea wouldn’t have given up the chase otherwise, nor is she implied to have dedicated any military force to finding him at any point innthe current days. We know they were eventually called the 10 Elites because Nemesis and the rest pretended Maurice was dead the moment he became a Beast and disappeared, and History likewise remembered it as only ten. Nothing in the game suggests Rhea thought Maurice was still out there, and she absolutely would not have let him live if she knew he was around due to knowing she made sure to hunt down the other ten.

​Bear in mind in Nopes Maurice being part of the Elites is documented, and they later became the 10 Elites (rather than 10+1) because of the "curse" associated to that Crest.

The same book suggests Maurice became "unhinged" after a battle in Gronder - so before Tailtean?

Rhea hunting the Elites is, imo, fueled by both vengeance/retribution but also by the wish to recover whatever was left of her siblings - Maurice "slained" a Holy Warrior and was still hoarding Blutgang - Rhea wants to recover relics (it's the reason behind Constance and Yuri's paralogue in FE16 and it's mentionned in Balthus'!).

Imo, even if Maurice died in a ditch, Rhea would have wanted to "recover" the relic.

So, in a way, the hunt for Maurice should have been both a hunt to rekt him - if he was alive - and a hunt to recover what was left of Bob - the Nabatean who became Blutgang.

Now, in the modern times, we know there are rumours and legends about a demonic beast in Mircea's forest, I can't fathom Rhea/the CoS not knowing a thing about it (hell, why weren't they asked to deal with this issue?) so why wasn't she taking care of him?

As Rhea the Archbishop, maybe she mellowed a bit and adopts a more "reaction" approach, if a relic pops up she will acquire it, but she won't send her people look behind every rock and box if there's a relic inside.

But as Seiros the Warrior? The same Seiros who went to war and spent around 100 years to hunt Nemesis? Who continued to hunt the Elites after Nemesis' death? This Seiros would have let Maurice escape or Bob remain in the ditch Maurice died in (if Maurice died)?

I can't see it - unless there is some event that makes her drop the "Warrior" persona and adopt her more passive "Archbishop" persona - which is what this headcanon (lycaon's death) tried to explain :

Seiros the Warrior is so gung-ho on avenging her dead siblings and "recovering" them that she cannot protect the future (Lycaon's supposed golden rule and the happily ever after ending post WoH!) and the present (Lycaon as a person? Especially if he was her kid!), so Archbishop Rhea (and her many names!) will try to oversee the present - if there is a relic around she'll recover it but she won't exclusively focus on it and won't spare attention to Momo when there are people who currently need her help right now (just like relics though, if there is an opportunity or occasion where Archbishop Rhea can face Momo or meet him, he's dead meat) - and the future - her rez Sothis plan.