Reign of Winter (private, solo)

Game Master Whack-a-Rogue

Yes, that's correct. Unless a sphere ability specifies otherwise, you can use it multiple times.

When you reveal yourself, the troll lumbers forward, throwing a large axe as she closes. Radosek, meanwhile, rises into the air. He appears to be fully healed.
Thrown Axe: 1d20 + 5 - 4 ⇒ (4) + 5 - 4 = 5

Based on your icon locations, I'm assuming you're on the 2nd-floor battlements. If that's in error, place yourself in the empty space in front of the troll - whose actions would be the same regardless of where you are. :-)

Staying on the second floor was the intention, yes!

Serael starts shooting her bow on the troll, hoping she will have enough arrows for Radosek, while Summer charges at the creature.

If Serael cannot see the troll, I'll 5ft. step closer. If that is impossible, ignore her rolls!

Bite, enhanced, charge: 1d20 + 9 ⇒ (8) + 9 = 17
Bite damage: 1d4 + 4 ⇒ (3) + 4 = 7

Shortbow 1, Enhanced, Barrage: 1d20 + 9 ⇒ (17) + 9 = 26
Shortbow 1 damage: 1d6 + 3 ⇒ (4) + 3 = 7
Shortbow 2, Enhanced, Barrage: 1d20 + 9 ⇒ (9) + 9 = 18
Shortbow 2 damage: 1d6 + 3 ⇒ (2) + 3 = 5