Again, reviewing the old books that you have not checked in a while is BAD for your mental health. In this case I was wondering what effects would a Hyperborean initiate be able to summon. The character concept is a guy that is charged by the spirits of the Thousand Columns sanctuary with reviving Apollo's worship in the area. They initiate him in ONE of the Hymns to achieve that. I thought that Pentiterouni would be the most appropiate one. In the end it came up much better than I expected. Let's see some of the effects I think it can achieve. Those are only samples, not finalized effects.
Obviously a given user cannot have them all since he would warp like a madman (and probably BECOME a madman in the process... a fairly depressed one) but these are a few effects I thought he could consider.
Pentiterouni effects
Create animal skin clothes. Not elegant, but functional. They offer a limited protection from damage (animal skin)
Skin an animal, either a dead or alive one (skin)
Avoid aging (aging and growth)
Pass an aging crisis (aging and growth)
Age someone to maturity (aging and growth) or cause an aging crisis
Make skin resistant to damage. Tough virtue or impervious (Gift of Caineus) (skin)
Healing body up to heavy wounds (skin, flesh, organs)
Healing body: incapacitating wounds (skin, flesh, organs)
Break bone (bones)
Heal bones (bones)
Remove the femur from a human being. It can be an alive one. It is counted as an incapacitating wound (bones)
Internal bleed (organs)
Heal organs (organs)
Invoke a yew bow (yew) or an ash spear (ash)
Throw an ash spear with perfect aim (ash)
Summon a yew bow and ash arrows (with onyx tip) in an animal skin quiver
Ash arrows coated in nightshade to deal more damage (ash, nightshade)
Coat something in nightshade venom. Maybe an arrow, maybe the apple you are eating (nightshade).
Turn into a yew tree (yew)
Cause someone to tremble uncontrollably (trembling)
Cause depression and despair (depression)
Remove one of the negative emotions listed in the Pentiterouni Mentem guidelines
Create an onyx (onyx)
Create a sapphire (sapphire)
Aura of rightful authority equivalent (authority)
Find a cave. It tends to be perfect for what is needed (organization, caves)
Lead a group of people in an activity, like construction or war (organization)
All kinds of cause/remove emotions using mentem. Removing the seriousness of the king when negotiating peace terms can be quite funny
After all that, I ended up thinking that concentrating in a single Hymn is not necessarily a bad thing after all. Specially if you want high levels of effect or a large number of them. Te amount of spell-like effects that you can generate with a single hymn are enough to make an interesting character that only possesses one of the hymns of Hyperborea. However, a dispersion of Hymns might be better if you only want low level effects; most hymns do not require penetration, so a high hymn total is not needed as long as you can enchant the effect into yourself and cast it. That level of proficiency would be enough. That would not allow you to sing "ceremonially spontaneous" effects all by yourself (choir), though.
Cheers,
Xavi