Round 1:
Standard: Cast Hold Person with Arcanist Point to increase DC to DC 22.
Move: Draw out Eternal Wand of Shield
Round 2:
Standard: Use wand of Shield
Free: Drop wand
Move: Close distance (arcanist slide if needed) draw mighty axe
Round 3:
Fullround: Coup de grace
Standard: Cast Hold Person with Arcanist Point to increase DC to DC 22.
Move: Draw out Eternal Wand of Shield
Round 2:
Standard: Use wand of Shield
Free: Drop wand
Move: Close distance (arcanist slide if needed) draw mighty axe
Round 3:
Fullround: Coup de grace
Rolled 6d8-6 : 7, 4, 1, 7, 5, 3 - 6, total 21