Arcane Wednesday - Dilation II from D&D 2nd Edition. This 6th-level spell is the second rank of the "Dilation" series, which extends the area of effect of other spells.
Dilation: Dilation I allows a wizard to increase the area of effect of any one spell of levels 1-3. The area of effect is increased by 25%; thus, a stinking cloud would fill a 25-foot cube, while a slow spell would affect creatures in a 50-foot cube. Fractions of feet or yards (as appropriate to the spell) are dropped. Dilation I must be cast immediately prior to the spell to be dilated; if a complete round or more elapses, the dilation is wasted. The dilation spell affects only spells which have areas of effect defined in feet or yards (numbers of creatures cannot be increased). The dilation affects only spells cast by the same wizard.
Dilation II: This spell functions exactly like the 3rd-level dilation 1 spell,except that the area of effect of a 1st,2nd, 3rd level spell is extended by 50%. Alternatively,the wizard may extend the area of effect of one 4th- or 5th level spell by 25%. http://regalgoblins.com/spells.php?caster=Wizard