While we're on the topic of street grimoire and great spirits...
On Street Grimoire pg 137, the sidebar about greater spirit powers, it list the powers that various spirits would gain in the "great" form, such as storm for air spirits.
However, for guardian, guidance, and task spirits, it states "as per base type of spirit". However, after reading through the spirits chapter multiple times, I can't seem to find anywhere that it mentions which powers would be appropriate for those, not can i find anywhere where it mentions "base types" for those 3 spirit types.
Now, fluff wise I can understand that this because you could summon a task spirit to make some shoes, or summon one to build a house, however, I would assert that a shoe task and a house task are different
sub-types and that all task spirits should have the same great form power based on their base type (Task), which would make their sub-type completely irrelevant. Which would in turn imply that the table on pg 137 is simply an errata candidate where someone forgot to replace the phrase "as per base type of spirit" with whatever power was supposed to be listed there.
Edit: Updated as errata.
This is per one of the developers, Giabralter:
Greater Spirit Powers:
Guardian: Shielding (SR5 p. 326)
Guidance: Psychometry (p. 119)
Task: Compulsion (SR5 p. 395)
Can we get a link or source or something? or was this you speaking to them IRL and we can take this as "official"?
Also, no offense intended by questioning your post, I know you're in contact with some people and all, I'm just looking for double confirmation.
It's a direct quote from a PM convo with Giabralter.
I can vouch for Giabralter ;-)