My group is playing through Shattered Star and I decided to have them each pick or custom-make a scaling item to help get their characters more integrated (half of this group has played through Rise of the Runelords with me, but some of the others are new to the group). This has worked remarkably well, except for one player that joined in late.
She's playing a Kitsune [voidkin] Psychic with the Aberrant discipline with a focus on debuffing and controlling targets; she was not seeing many helpful or useful scaling items. I'm attributing this to how close together Occult Adventures and Unchained came out, but I was surprised to not see any results from googling around to see if someone had thought up any items.
So, I'm here to ask you guys for ideas, see what your creativity can lead to. We're playing with Automatic Bonus Progression and Scaling Items on the Medium XP track and restricted to Bauble or Prize category scaling items. Right now, we're in Kaer Maga.
I was thinking maybe something for extra DC increases or recharging phrenic pool points at the cost of spell slots? There's a lot of moving parts for Psychics, so there's lots of options for a scaling item.
If you want to have more direct scaling items, you can follow the model of existing scaling items and swap out particular spell-like abilities, for example, for more psychically-geared items. For example, you could base something on the Fivefold Rings Of Fire from Unchained but replace scorching rays with, say, mind thrusts.
Alternatively, the scaling nature fits well with the scaling nature of undercasting/overcasting. Items could unlock higher levels of spells as the player grows in level, or the item could open up new spell slots or options for undercasting or other things following the "tiers" of the item.