Extend Spell

Cost
Cost 50% more spellpoints.

Gives
+100% duration.

Other
This extends the duration of summon spells, however, you may only have one summoned creature at a time.

Tips
Extend is great for granting teammates long buffs, of 10 minutes or more. If you are about to use a shrine and have spellpoints left, consider passing out some extended buffs- but only to players not about to rest themselves, because resting dispels buffs. (That technique is particularly important when you are at a shrine to which you will be unable to return). In general, spellcasters should try to use all their sp on something useful before resting, and extended buffs is a way to do that (aside from repair/heal, of course)