Portal Stabilization(Underdark, p. 60)
Level: Portal (Alternative) 1,
Components: V, S, DF,
Casting Time: 1 round
Range: Close (25 ft. + 5 ft./2 levels).
Target: One portal
Duration: 1 minute/level
Saving Throw: None
Spell Resistance: No
You temporarily stabilize a malfunctioning portal,making it safer for use.
Any time the portal is activated during the duration of this spell (or immediately, if it is continuously active), add +30% to the required roll on Table 2-2: Portal Malfunction in the FORGOTTEN REALMS Campaign Setting.