Freezing Shots
Phantom Sentry starts with some shots which will freeze one or more of our friends. So it would be a wise idea to equip Ronfar with the Fresh Ring you will find in the hidden cave (refer to tips section for the location). Ronfar won't freeze and can heal in the next round!

Skewer Star
Phantom Sentry will let you see stars. This attack will effect everybody in range, which in fact is the whole battle area.

Standard Attack...
... hits one of your party. Definitely his weakest attack.

Jerk Shot
Shooting like crazy. That's what seems to be one of Phantom Sentry's favorite. Ask Ronfar for some healing spells after this attack (Calm Litany would be nice!).