Metamagic feat 1
[Enhance Spell]
The damage cap of a spell is doubled.
When a spell caps out on the amount of damage it can do, a spell caster can cast the spell as one level higher to double the cap.
Example, fireball caps out at 10d6 damage. This feat allows you to double the cap to 20d6.
Cross reference delayed blast fireball and chain lightning. Also see below. (For reference, fireball/lightning is level 3. Delayed blast fireball is level 7 and chain lightning is level 6.)
[Delayed Spell]
A caster can delay the effects of a spell.
A caster can choose to delay when a spell comes into effect up to 5 rounds or less. The spell effect can be physically manipulated in a manner consistent with the current wording of delayed blast fireball. A spell cast in this manner takes a slot 3 spell levels higher than normal.
[Chain Spell]
A caster can attack multiple targets with a line attack.
A caster chooses a primary target. If the line or ray attack succeeds, the caster can deal half damage to any additional chosen target within 30' of the primary target. For ranged touch attacks, the caster must roll each target separately at a -5 to attack. Spells cast in such a manner takes a spell slot 2 levels higher than normal.