Karma Shards are earned by completing Notable Deeds and claiming the rewards at a Pale Raven's Perch or the Shrine of Causality. The supported method is to work through unfinished deeds while playing the game, rather than assume an enemy drops an unlimited supply. Because deed progress is shared across routes, useful activity on another protagonist's path can still contribute to the same long-term currency plan.
If you arrived looking for an infinite farm, the guides cited here establish milestone rewards rather than a renewable enemy drop. It does establish where the currency comes from, where to claim it and what it can buy. That distinction matters because repeating an activity after its associated milestone is complete is not the same as receiving that milestone's reward again.
Read the unfinished deed list first
Open the deed list at the Perch before choosing a task solely for Karma Shards. RPG Site's Notable Deeds guide describes milestones involving ore collection, searching and support conversations, among other activities. These are categories of achievement progress, so your actual unfinished list is more useful than a fixed route that assumes every save has the same remaining objectives.
Identify a deed that overlaps with something you already need to do. Gathering for a material requirement or pursuing an available relationship conversation can advance more than one goal without turning the entire session into an unrelated chore. The recommendation is to reduce duplicated effort, not a claim that every action in those systems awards shards directly.
Claim rewards before assuming the balance is wrong
Game8's Karma Shard guide explicitly separates completing a Notable Deed from claiming its Karma Shards. It names the Pale Raven's Perch and Shrine of Causality as the places to collect those rewards. If you have been progressing deeds but have not checked the collection menu, inspect it before concluding that the activity failed to count.
This also gives you a natural point to review your next purchase. Read your current balance, available rewards and the cost shown for the Boon you want before leaving the menu. Plan around the actual milestone and purchase displayed on your save, since an arbitrary number of dungeon runs does not identify the unfinished deed.
Use shared progress across routes
Notable Deeds are global rather than assigned independently to each Flame Lord. RPG Site states that progress can accumulate across multiple routes and replays, while Polygon's early Boon explanation also describes a shared deed list. A route change can therefore expose new activities while preserving the value of progress you already made.
Shared progress does not establish that a completed deed resets and pays again. Treat a replay as another opportunity to work toward unfinished requirements, not proof of a renewable claim exploit. If your next step involves changing protagonists, the route overview and story progress guide can help keep that broader objective separate from the shard menu itself.
Turn shards into the bonus you actually need
Boons of Salvation are a major use for Karma Shards. They include battle experience increases, individual proficiency bonuses and discounts on purchases or services, and their benefits apply across routes. RPG Site also notes that purchased Boons can be toggled, allowing the player to decide which conveniences to use.
Choose a bonus that addresses a present bottleneck. If certification progress is the issue, consult the class requirements before spending on a proficiency you will not use. If recruiting a particular character is the issue, compare the planned gift spending with the value of other purchases rather than assuming the same Boon order fits every army.
Understand what the experience bonuses affect
Game8's Boon guide states that weapon, magic and movement-skill experience Boons apply to battle gains rather than training. That restriction is important when deciding how you will use a newly purchased bonus. A player mainly visiting training menus should not assume that a battle-specific Boon improves those sessions too.
The same guide distinguishes general character experience from the separate skill bonuses. Buy for the type of progress you need, then check the relevant character screen to see that progress rather than judging every purchase through the ordinary level number. For a recruitment-focused plan, the support guide and gift finder address relationship choices more directly than an unrelated skill purchase.
Keep later spending separate from early convenience
Shards also have uses connected to route carryover and character development later in the game. Game8 describes withdrawing stored items, materials, mounts and battalions through the Drifting Reliquary after completing a Part II path. The same source explains that Merge Causality becomes available after the first section of Part III for characters recruited in multiple paths.
RPG Site explains that merging takes the higher values from the relevant character versions rather than adding all their statistics together. That makes a merge a comparison between actual versions you developed, not a promise that any duplicate automatically becomes dramatically stronger. Review those versions and the displayed cost when the feature is relevant instead of reserving or spending currency on an imagined result.
Build a practical shard routine
A useful routine begins at the deed list, continues through activities you already have a reason to perform, and ends with a claim and purchase check. Prioritize unfinished milestones that align with your current route, roster and resource needs. This approach follows the documented achievement system without pretending that a single fixed activity has the best payout for every save.
Check the reward name in the Notable Deeds menu before choosing a target. Class and weapon proficiency from a dungeon Clash are separate rewards, so repeating the battle does not by itself establish a repeatable Karma Shard payout. Use an unfinished deed's listed conditions and reward to judge whether that session actually advances your shard goal.
Once the intended purchase is affordable, decide whether further shard-focused activity serves a real objective. Story progress, recruitment and class development can all remain worthwhile even when a particular deed is already finished. The goal is to let those systems contribute naturally to remaining achievements while avoiding an unsupported promise of unlimited rewards.