Twin Spell [Metamagic]
REQ: Any other metamagic feat
Casting a spell altered by this feat causes the spell to take effect twice on the target, as if you were simultaneously casting the same spell two times on the same location or target. Any variables in the spell (cuch as targets, shaping an area, and so on) apply to both of the resulting spells. The target suffers all the effects of both spells individually and receives a saving throw for each (if applicable). In some cases, failure of both the target’s saving throws results in redundant effects, such as a twinned charm person, although any ally of the target would have to succeed at two dispell attempts in order to free the target from the charm. As with other metamagic feats, twinning a spell does not affect its vulnerability to counterspelling. A twinned spell uses up a spell slot four levels higher than the spells actual level. Tome and Blood, pg 42.
p.s. Lets assume we are playing with the 3.5e Haste rules.
REQ: Any other metamagic feat
Casting a spell altered by this feat causes the spell to take effect twice on the target, as if you were simultaneously casting the same spell two times on the same location or target. Any variables in the spell (cuch as targets, shaping an area, and so on) apply to both of the resulting spells. The target suffers all the effects of both spells individually and receives a saving throw for each (if applicable). In some cases, failure of both the target’s saving throws results in redundant effects, such as a twinned charm person, although any ally of the target would have to succeed at two dispell attempts in order to free the target from the charm. As with other metamagic feats, twinning a spell does not affect its vulnerability to counterspelling. A twinned spell uses up a spell slot four levels higher than the spells actual level. Tome and Blood, pg 42.
p.s. Lets assume we are playing with the 3.5e Haste rules.