Much of the time I think of items as addons to a build, and focus on the race, class, and feat progression when planning. However, in both Westmarches and many standard canpaigns, it is not unreasonable to be able to buy, craft, or at least request some specific items, at least going up to Rare rarity. That got me thinking about trying to optimize a build around the item, rather than the other way around.
Out of the Abyss provides a unique and interesting Rare item, the Stonespeaker Crystal. It has 10 charges, regains ~7 per day, allows spending some charges to cast the three Speak With spells, and, most importantly, allows expending a number of charges equal to a divination spell's level to replace one consumed spell component. The following divination spells have consumed spell compoments:
- Divination (4) 25gp¹
- Fortune's Favor (2) 100gp
- Legend Lore (5) 250gp
- True Seeing (6) 25gp
¹uses two components with combined cost of 25gp, so the crystal can only replace one of them.
If you play with EGtW, the obvious use case for this is the Graviturgy or Chronurgy Wizard, getting Fortune's Favor (upcastable for more targets, letting you safely cover a party at least once per day with a 1-hour long Lucky d20 each). You also get Legend Lore (cast for free once per day to keep improving your results about the same thing) as well as True Seeing as a Wizard, and since TCoE expanded Wizard spells to include Divination, you don't even need Ritual Caster Cleric to get the full set. It's nice to have the crystal on a Wizard who normally doesn't get Speak with Animals or Speak with Plants too.
The most broken use of this item that I can think of is, conveniently, with Chronurgy's Arcane Abeyance on Fortune's Favor. Cast Fortune's Favor at 5th level on four members of the party, and then also save a bead with a 4th level casting to re-up three party members' Lucky dice mid-combat, increasing the likelihood they actually use them. Between that, Chronal Shift, Silvery Barbs, and Convergent Future, you might as well be the DM now.
Even without EGtW, a Divination Wizard can benefit greatly from the Stonespeaker Crystal thanks to Expert Divination, effectively reducing the total burned cost of Legend Lore to one fifth of a spell slot. Again, after enough castings, you at least know as much as the DM does, and with Portent and Silvery Barbs can control the outcome somewhat.
Did I miss any synergies worth exploring?
Great! Then either talk to her to come up with ideas, or if you're determined to ask the internet, telegraph your united front in your question so that we don't assume that the primary reason is that you are a shitty partner. Read your question again, just the words, and see if it sounds like the author actually likes their partner, or wants help from the internet changing them to make this game more fun for themselves?
Anyway.
A live session with just voice chat is already a heavy mental toll for some people. Players and DM alike are filtering and translating ideas through one or more layers (what should be done? would this PC/NPC think to do X? How does doing X look like in this setting? Do they have the materials necessary? Would they countenance doing X based on their personality? What would they say alongside it, with what accent and affect?) in real time. Imagine trying to also type while thinking through those thoughts, and wanting your words to be well written, and your grammar and syntax to be correct, and your immortal words to be self-consistent across multiple posts? AND while you are working on all those things there is also distracting crosstalk? Or worse, you're in a quiet room typing by yourself, but you know that three or more people are talking about what you're typing in a little huddle? There is no consistent human response to this situation.
It's an objectively complex format. Some people may find it easy. Some people may be able to ignore or eschew some of their own internal requirements that are consuming their mental energy and game time. And some people may not, and then external pressure to do so can make them stressed, which makes all of what I wrote harder to manage.
You could go text-only, with multiple text channels (roleplay vs ooc vs initiative) and strict timers, e.g. 5 minutes (which, speaking from personal experience, is also draining) just get rid of the voice chat. Or as others said, go with truly async play-by-post with 24 hour timers. Sure, a single combat may take a week to resolve, but it gives everyone plenty of time to do all of the mental load required to play, without all the pressure of realtime translation.