Ethereal Storm - Summons a storm that deals random elemental damage to enemies and heals allies.
Here are the best options in these skill lines for an Inquisitor. Hydrosophist can only really be used for healing and magical damage. Summoning and Geomancy can deal both physical and magical damage depending on the skill. With this in mind, the only other skills that may work well with these are Summoning, Geomancy, or possibly Hydrosophist if the player wants this character to fill the role of healer too. Only later on will the players need to diversify their damage. Usually, the best choice to go up against enemies in Act I and II is to keep all the character's damage of the same type to all fight the same shield base. This is because when a player deals magically based damage instead they are attacking a different shield. Due to this class being entirely based around dealing physical damage, the player will likely want to stick to that type of damage base when looking at new skills.
