I was thinking of making the Effect slow the target (until end of your next turn?) instead of 1d4 + int dmg, adding Cold to the keywords and changing the Hit damage to Cold instead of Fire damage.
Anyone have any suggestions or advice?
I've added the Wizard Lvl1 spell below for quick reference.
You conjure a rolling ball of fire and control where it goes.
Daily Arcane, Conjuration, Evocation, Fire, Implement
Standard Action Ranged 10
Effect: You conjure a Medium flaming sphere in an unoccupied square within range. The sphere occupies its square, and it lasts until the end of your next turn. Any creature that starts its turn adjacent to the sphere takes 1d4 + Intelligence modifier fire damage. As a move action, you can move the sphere up to 6 squares.
When the sphere appears, it immediately makes the following attack. While the sphere persists, you can use a standard action to command it to make the attack.
Target: One creature adjacent to the flaming sphere
Attack: Intelligence vs. Reflex
Hit: 2d6 + Intelligence modifier fire damage.
Sustain Minor: The sphere persists until the end of your next turn.