Is it me ot its missing this last part in bug Fixes from Publish 69 announcement made yesterday ?
Just like Magery, the casting difficulty when using scrolls for Necromancy, Spell Weaving and Mysticism has been lowered by 2 "levels/circles".
Spell Weaving and Mysticism scrolls still require the minimum skill to cast them from a spell book to use. (#Note by me: i.e. success chance increase only, instead of actually make them cast-able with lower skill)
The duration of polymorph-style spells (e.g. Vampiric Embrace) is now a maximum of 3 minutes when the caster doesn't have the actual skill required to cast them from a spell book.
A minimum of 30.0 in both Necromancy and Spirit Speak is needed to cast Summon Familiar now.