Makes it a bit weaker, but still quite a spell...You need not call a bolt of lightning immediately; other actions, even spellcasting, can be performed. However, each round after the first you may use a standard action (concentrating on the spell) to call a bolt. You may call a total number of bolts equal to your caster level (maximum 10 bolts).

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.