Elaborating, as promised.
me >Nobiran Wizard (Nature) has a unique variant of Martial Training proficiency p.49
alex >Nah. It's just Martial Training proficiency option 4, "swords/daggers". He already knows how to use daggers, so I didn't repeat it.
No, that's the one from Nobiran Wizard (Fellowship). Nobiran Wizard (Nature) adds short bows, short swords, and spears, which is a new one!
me >Hypnotic Pattern is level 3 (Grey), should be level 2 like the arcane version p.122
alex >Hmmm. My master spreadsheet has Hypnotic Pattern costing 28.8. It was 2nd level in the game but was a "boosted" spell like Sleep and Fireball.
alex >All of the "boosted" spells were re-tooled or moved to their appropriate level in HFH. What formula are you using? Did I make an error in my initial calculations? It definitely ought be level 3 for HFH purposes...
Sorry, that one slipped through, and shouldn't have been on my list! You haven't published a design for Hypnotic Pattern, so I can't do checking based on it.
me >Invisibility spell is Eldritch 4 (Grey), should be Eldritch 3, since design cost is 30.375 p.122
alex >I calculate cost as 32.9. In any case, the "Source Modifier Factor: Eldritch inaudibility or invisibility x1.5" was set specifically to make sure Invisibility was 4th level for HF, since it's so powerful relatively speaking.
Invisibility HAS got a published design in the Player's Companion p.119, summing to 20 for arcane (20.25 exactly), which correctly makes level 2.
Applying the eldritch modifier of x1.5 gives 30 (30.375 exactly).
Is your value of 32.9 coming out of that published design from PC, or an eldritch-specific one to boost the level as you want?
alex >There is errata introduced in Heroic Fantasy Handbook. Attack throw is supposed to cost x0.75. x0.35 was erroneous in PC.
I NOW see the note that was ALWAYS there pointing that out on p.210! How did I miss that! (Though it incorrectly mentions x0.25 as the PC value)
me >Ice Sheet design has Affected as wood costing x0.5, should be x0.4, cost becomes 31.575 p.218
alex >Good catches. However, I calculate Ice Sheet as 41.57, not 31.57, leaving it still 5th level.
A typo at my end - that should have been 41.57.
I've reviewed those 120' Weave spells, and they all look correct.