Writing

Writing uses the tiered crafting system: tier = complexity + item quality bonus + other bonuses.

Fractions will at least yield items in the lower quality, while having a chance at a higher tier.

1.35 yields a tier 1 item with a 35% chance for a tier 2 item. Tier 0 is considered a failed craft and does not yield any items.

Some of the writings also yield a few techpoints.

Only duration goes up

Example desk II: notes + gold story + perks = -1.5 + 3 + 1.2 = 2.7, so 70% gold chance, and when it fails guaranteed silver.

Prayers
Writing prayers is not influenced by any bonuses.