Oh, that cluster of targets is lovely - pity I don't have a seeker power that lets me move and attack.
Using Evasive Strike on the creature in Y8 - this allows me to shift 5 squares before the attack, which I will use to move Galadren out of the entry room and around the hallway's corner, and as far down the hallway towards the room as possible (probably 1, 2 squares forward of the corner then?)
Galadren will apply his Sneak Attack damage for the encounter if this attack hits, and will use his Elven Accuracy Reroll should he miss the first time.
Evasive Strike:
Effect: Galadren shifts up to 5 squares before attacking
To-Hit:
Rolled 1d20+6 : 7 + 6, total 13
vs AC
Damage:
Rolled 2d8+4 : 1, 4 + 4, total 9
plus
Rolled 2d6 : 6, 1, total 7
Sneak Attack
Elven Reroll (if necessary) - if I have to decide whether or not to use it before I know whether the first shot would hit or miss, I will reroll on a less than <18 result.
To-Hit:
Rolled 1d20+6 : 3 + 6, total 9
vs AC