[Anthony]

Originally Posted by dataweaver

1 point in a spell: same rituals, cost, and time as listed for skill 9 or less.
2 points in a spell: same rituals, cost, and time as listed for skill 10–14.
4 points in a spell: same rituals, cost, and time as listed for skill 15–19.
8 points in a spell: same rituals, cost, and time as listed for skill 20–24.
12 points in a spell: same rituals, cost, and time as listed for skill 25–29.
+4 points: same as +5 skill.

I would generally split it out a little more, such as:

• IQ+Magery-3 (1p in VH): ritual requirements as per skill 9 or less.
• IQ+Magery-2 (1p, 2p in VH): ritual requirements as per skill 10-14.
• IQ+Magery-1 (2p, 4p in VH): ritual requirements as per skill 15-19.
• IQ+Magery (4p, 8p in VH): ritual requirements as per skill 15-19, -1 cost.
• IQ+Magery+1 (8p, 12p in VH): ritual and time requirements as per skill 20+, -1 cost.
• IQ+Magery+2 (12p, 16p in VH): ritual and time requirements as per skill 20+, -2 cost.
• Each additional +2 skill gives -1 cost and half casting time.