Spellweaving

Spellweaving is a special magic skill in Ultima Online. It was created for several mages to come together and weave their spells together, to make them much stronger. However, it also is still very powerful when used alone. Besides needing Meditation for mana, one can't learn Spellweaving from the start. First two quests have to be solved, before the spellbook and the most basic spell are given, then the rest of the spells has to be found.

The skill was thought to encourage players working together, but the usage of the Arcane Focus crystals nullifies this intend.

Training
To train the skill as fast as possible, follow this guide for which spell to ast a lot at which skill level for maximum effect.

Ultima Saga
In Lynn Abbey's Ultima Saga, the wizard Balthan utilizes scrolls of spells far outside of his level of spell mastery to create unique effects. He originally thought that this was taught to him by a vision of the Avatar, but later begins to believe it was a trick by the Shadowlords. In either event, no other wizard seems to know about this type of spell combining, which might be a form of Spellweaving.