FORGOTTEN REALMS Campaign Setting.

" /> Spell - Portal Stabilization
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Portal Stabilization

(Underdark, page 60, DnD 3.5)

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Transmutation


Level: ArrayPortal (Alternative) 1
Components: V, S
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.