Jan flinches involuntarily as the trident suddenly pierces the veil of fumes to head more or less in her direction... but as it fails even to impact one of her illusory doubles, the gnome lets out a peal of laughter. "It seems that the gas is affecting your aim, your wits having already been too addled for a difference to be clear!" taunts the sorceress. Nonetheless, she takes a few steps toward Lydia, clearing her throat and gesturing the cleric to draw close...

Spoiler: Actions
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Posting since I have time, but the idea is to have Jan move to N,22 and cast Enlarge Person on Lydia under the assumption that Lydia moves adjacent to her to do so.

If Lydia is not interested in doing that, I can instead use Acidic Ray at H24:
Attack: (1d20+5)[14] vs touch AC
CC: (1d20+5)[6]
Damage: (1d6+2)[7] acid damage
Crit damage: (1d6+2)[4] acid damage

Spoiler: Stats
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Janstina Silentall
F Chaotic Good Gnome Sorcerer, Level 5, Init 4, HP 37/37, Speed 20
AC 17, Touch 13, Flat-footed 15, CMD 11, Fort 4, Ref 4, Will 4, CMB -1, Base Attack Bonus 2
Acidic Ray Ranged (1d6+1/2lvl, x2)
Dagger Melee (1d3-2, x2, 19-20)
(+4 Armor, +2 Dex, +1 Size)
Abilities Str 6, Dex 14, Con 14, Int 10, Wis 8, Cha 23
Condition Mage armor: +4 AC, 1 hr
Mirror image: 4 images, 5 minutes dur.