Before you spend a single Murmuring Obol, take a look at the weakest part of your build. That's where the Purveyor of Curiosities can be useful. If your weapon is holding you back, start with weapons. If your armor is doing its job but a ring is missing a key stat, try the ring category instead. The goal isn't to collect more D4 items for the sake of it. You're looking for a piece you can actually wear.

Make room before you roll

A few purchases can fill your inventory faster than you'd think, so clear some space before visiting the vendor. Sell or salvage gear that's plainly worse than what you already have, and keep only pieces with a real use in mind. Once you start rolling, check each item against the slot it could replace. Don't let a glowing affix or a high item power make the decision for you. A useful resource or cooldown stat can matter more than a bigger number.

Check your Obols and set a reserve

Open the Purveyor's panel in Kyovashad or another town with the vendor, then check your current Obol count, the currency cap, and the prices on offer. Don't rely on a number you remember from an older season. If you're close to the current cap, spend enough to make room before heading back into the open world. Otherwise, there's no need to rush through your entire supply. Keep enough for at least one purchase from the most expensive category currently listed.

Check the currency tooltip and note how much room you have before reaching the cap.
Choose the gear slot that has the best chance of improving your current build.
Compare the price of any listed key or specialty purchase with the cost of rolls for that slot.
Stop when you reach your planned reserve, unless you still need room for upcoming Obol rewards.

Look at your Boons, then move on

If you've already invested in Curious Addition, read its current tooltips before buying. A node may affect the vendor's cost, item quality, or extra-item chance, and the wording on your screen is what matters for your character. Haven't put points there You don't have to rearrange your whole plan for one shopping trip. Use the vendor as it stands, or consider a clearly priced node if it fits the build you're already working toward.

Leave with a clear plan

After the spending run, note your starting Obols, the amount spent, the upgrades equipped, and what remains in reserve. No upgrade is still a decent result if you've made room for more currency and kept your inventory tidy. A short event or Helltide run can refill your supply later, but remember to return to the Purveyor before hitting the cap again. Some players also choose to buy cheap D4 items when looking for a particular piece, though the Obol plan works best when it stays focused on the slots that need attention.