To test Diablo 4 Runes on the PTR, select Public Test Realm from the launcher's Game Version menu, create a Seasonal test character, and use the Grant All Runes boost. The PTR provides Diablo 4 runes (https://www.u4gm.com/diablo-4/item) for comparing your existing pairs without collecting them first.
Set up a repeatable Rune test
A Runeword combines one Ritual Rune, which generates Offering when its condition is met, with one Invocation Rune, which spends Offering to produce an effect. The supplied 3.3.0 PTR notes list Que at 500 Offering instead of 300 and Lac at 600 instead of 400.
You can equip two Runewords at once, using four Runes total, but cannot use the same Rune name twice. Use a suitable item with two sockets, such as a helm, chest piece, pants, or two-handed weapon.
In the launcher, open Game Version and select Public Test Realm. Create a Seasonal test character and visit the PTR vendor near the main Waypoint for the Grant All Runes boost.
Equip the Ritual and Invocation pair used by your current build. Keep your skill bar and other equipment consistent when comparing results.
Run an Infernal Hordes compass or a fixed Pit route at a Torment tier your live character can clear. Count Invocation activations and record clear time and deaths.
Swap the Ritual or Invocation Rune, then repeat the same activity under comparable conditions. Watch the Offering bar and count the activations again.
Compare the results with a matching run on the live character if you want to assess the old costs. The PTR uses the listed new thresholds, so changing equipment on the PTR does not restore the previous costs.
A successful test gives you a visible Offering bar to watch and Invocation activations to count during the run. If an expected effect rarely appears, check that the Ritual condition is being met often enough before replacing the Invocation.
Choose a pair that fits the build
Higher Offering costs mean Que and Lac need more Offering before their effects activate. A Ritual tied to cooldown use may leave longer gaps between activations, while a movement-based Ritual may suit a build that travels constantly.
Compare the actual activations, not just the effect shown on the Rune. If a pair triggers too infrequently to justify its damage or utility, try a lower-cost Invocation on the same route. Swapping Runes does not require a jeweler visit, so adjustments are straightforward.
The Armory can warn when a loadout would break the two-Runeword rule. Check the equipped Rune names as well: repeating a name is not permitted, even if the two pairs otherwise fit your sockets.
Inspect Word of Power before spending points
Word of Power is a node on the Merchant of Mystery path in Tyrael's Boons. It requires Vessel of Hatred and adds Rune Cache options to Master Mercer's stock; Mercer appears in Torment difficulty in Temis and Gae Kul and sells caches for Forgotten Souls.
The supplied PTR information lists rank 1 as adding a Rune Cache up to Magic quality, with later ranks listing two Runes up to Rare and three up to Legendary. Read the current tooltip and inspect Mercer's stock before planning purchases, since PTR values can change.
Unassigning Boons points costs 5,000,000 gold per point in the supplied PTR notes. Decide whether Rune Caches or other Mercer options matter more to your build before committing points.
The supplied schedule lists the PTR closing on November 3 at 10:00 a.m. PST, and PTR stash contents do not carry into Season 16. Save your activation counts, then review your live Rune pairs and compare them with Diablo 4 Items for sale (https://www.u4gm.com/diablo-4/item) only after deciding which pieces your build actually needs.