Knightfall
World of Kulan DM
Angus - Spot and Listen checks: 1D20+12 = [3]+12 = 15
1D20+8 = [4]+8 = 12
Angus hears Xander but doesn't see him. He can't pinpoint the invisible dwarf.
Timmins - Spot and Listen checks: 1D20+4 = [13]+4 = 17
1D20+4 = [13]+4 = 17
Timmins hears Xander but doesn't see him. He can't pinpoint the invisible dwarf.
Wieland - Spot and Listen checks: 1D20+5 = [3]+5 = 8
1D20+5 = [4]+5 = 9
Wieland doesn't see or hear anything!
Meridith - Spot and Listen checks: 1D20+9 = [20]+9 = 29
1D20+9 = [16]+9 = 25
Meridith's Spot result of 29 becomes a 39. So, she both notices Xander using Listen and Spot and can pinpoint him with her Spot check. She gets to attack him in round 14 with a 50% miss chance.
Aureus - Spot and Listen checks: 1D20+11 = [6]+11 = 17
1D20+11 = [17]+11 = 28
Aureus hears Xander but doesn't see him. Her Listen check is high enough to locate the dwarf's movements, which means see can attack him in round 13 with a 50% miss chance.
1D20+8 = [4]+8 = 12
Angus hears Xander but doesn't see him. He can't pinpoint the invisible dwarf.
Timmins - Spot and Listen checks: 1D20+4 = [13]+4 = 17
1D20+4 = [13]+4 = 17
Timmins hears Xander but doesn't see him. He can't pinpoint the invisible dwarf.
Wieland - Spot and Listen checks: 1D20+5 = [3]+5 = 8
1D20+5 = [4]+5 = 9
Wieland doesn't see or hear anything!

Meridith - Spot and Listen checks: 1D20+9 = [20]+9 = 29
1D20+9 = [16]+9 = 25

Meridith's Spot result of 29 becomes a 39. So, she both notices Xander using Listen and Spot and can pinpoint him with her Spot check. She gets to attack him in round 14 with a 50% miss chance.
Aureus - Spot and Listen checks: 1D20+11 = [6]+11 = 17
1D20+11 = [17]+11 = 28
Aureus hears Xander but doesn't see him. Her Listen check is high enough to locate the dwarf's movements, which means see can attack him in round 13 with a 50% miss chance.