: 1) Does Rabican dies at Seven Gates?
Probably. Certainly, his forces are annihilated there, and he doesn't live to see the end of TFL.
: 2) Why does Alric do not take the throne of Cath-Bruig
: after TFL?
Probably for two reasons: 1) There would have been very little point, since everyone in the Cath Bruig empire was dead. I suspect he only did so during the war against Soulblighter because of the moarle boost it would have given his men. 2) He was probably extremely busy trying to rebuild the Province and the Free Cities of the North: only Tandem was still standing by the time of Balor's defeat.
: 3) What the heck is Black Company?
A series of books which I haven't read and which Bungie apparently used as inspiration for the plot of Myth.
: 4) How come Balor is stronger than Watcher? (Watcher
: having been existing for a longer time...) If it was
: because of Leveller, then why did Leveller did not
: choose Watcher?
My guess is that it was a combination of the factors that Balor was by far the better tactician of the two and that the Watcher was trapped in the Cloudspine at the time.
: 5) How old is Alric in SB? He seems incredibly fit for a
: man of his age...
Probably in his 80s. (Tales from TFL tells us that the war was already raging when Mauriac assumed the title of Regent, since Alric was still in his adolescence at the time). Presumably, Archmagi of his power are capable of holding back the detrimental effects of ageing for much longer than normal humans, though true unagingness seems to be only possible if you're either a Heron (absolute purity of spirit) or a Fallen Lord (evil sinister rituals).
: 6) What happens to Myrmidonnes after the TFL?
GURPS says that they split up into smallish warbands roving across the Barrier. Since their oath of allegiance was to Balor, they were under no obligation to the Fallen following his death.
: 7) Did all of the nine except Alric died at TFL?
Maeldun was severely wounded and died after the end of TFL. All the others except Alric died before.
: 8) I do not understand the concept of Shades and
: Avataras... They say Mazzarin was a Avatara and kills
: Sinise, but he becomes a shade himself!! And how does
: Alric know Sinise so well?
There's a number of theories on this one. Either: ShadeMazzarin kills AvataraSinis and raises his body as a Shade. Or ShadeMazzarin severely injures AvataraSinis, who chooses Shadification as preferable to death. Or AvataraMazzarin kills AvataraSinis and much, much later, the Watcher raises both of them as Shades.
: 9) When are they making the next myth?
Next blue moon.