Hello there. Time for another ruling or research from fellow DMs.
This time, it's me as a player, tackling an issue I've never really come across before. My group has always taken it forgranted that you do not
get bonus spells from magic items that give enhancement bonuses directly to ability scores, ala cloak of charisma
or headband of intellect
The portion of the PHB that deals with improving ability scores says the following:
Over time, the ability scores your character starts with can change. Ability scores can increase with no limit.
--Add 1 point to any score at 4th level and every four levels your character attains thereafter (at 8th, 12th, 16th, and 20th level).
--Many spells and magical effects temporarily increase or decrease ability scores. The ray of enfeeblement spell reduces a creature’s Strength, and the strength spell increases it. Sometimes a spell simply hampers a character, effectively reducing his or her ability score. A character trapped by an entangle spell, for example, acts as if his Dexterity were 4 points lower than it really is.--Several magic items improve the user’s ability scores as long as the character is using them. Gloves of dexterity, for example, improve the wearer’s Dexterity score. (Magic items are described in the DUNGEON MASTER‘s Guide.) Note that a magic item of this type can’t change an ability score by more than +6.
--Some rare magic items can boost an ability score permanently, as can a wish spell. Such a bonus is called an inherent bonus. An ability score can’t have an inherent bonus of more than +5.
--Poisons, diseases, and other effects can harm an ability (temporary ability damage). Ability points lost to damage return on their own at a rate of 1 point per day for each damaged ability.
--Wraiths and certain other undead creatures drain abilities, resulting in a permanent loss (permanent ability drain). Points lost this way don’t return on their own, but they can be brought
back with spells, such as restoration.
--As a character ages, some ability scores go up and others go down. See Table 6–5: Aging Effects, page 93.When an ability score changes, all attributes associated with that score change accordingly.
For example, when Mialee becomes a 4thlevel wizard, she decides to increase her Intelligence to 16. That gives her a 3rd-level bonus spell
(which she’ll pick up at 5th level, when she is able to cast 3rd-level spells), and it increases the number of skill points she gets per level from 4 to 5 (2 per level for her class, plus another 3 per level from her Intelligence bonus). As a new 4thlevel
character, she can get the skill points after raising her Intelligence, so she’ll get 5 points for achieving 4th level in the wizard class. She does not retroactively get additional points for her
previous levels (that is, skill points she would have gained if she had had an Intelligence score of 16 starting at 1st level). (Page 10)
With that said, I can't find any line in any of the core books to say you do not. I've also found this in
Once you have seen to basic defensive needs, your best bet is to boost your spellcasting ability score as soon as you can, with a headband of intellect
or a cloak of Charisma</i>. (...) Your benefits from these are more spells and higher save DCs.
So as I can see it, improved ability scores would provide additional bonus spells. I would grant that the item would need to have been worn over a 24 hour period first, and the standard pre-spell rest period would be required before granting the bonus spells. If the item was removed, the bonus spells (prepared or slots available) would be instantly lost, and would again have to be prepared / gained after a standard rest period, just like any other time your spells fizzle.
Ruling from the community?
As a side note, the above information from the PHB would make it seem to me that a headband of intellect
would also provide bonus skill points, as long as it was work during the transition between levels. The flaw being, "Ooh, this fight will bring my character up to 9th level, hey Richard, have your character toss over his headband, I'll give it back right afterward!" I personally would rule that the character would have had to have had the headband on the entire time he spent at 8th level, from the transition up from 7th, all the way through, to reflect that his enhanced intellect was working on "improving" the skills during the level to accurately reflect that he had more ranks to put in them, and that removing the headband would not
remove the skill points in that circumstance because the skills had been built over time, not instantaneously.
Ruling from the community?
x-posted a few places for better response