Idle Heroes Primal Grimoire Upgrade Priority Guide

To get the most value from the Primal Grimoire in Idle Heroes, invest in Speed nodes first to secure turn order, followed immediately by percentage-based Attack and All Damage Dealt nodes. Because Grimoire upgrades grant permanent, account-wide stats that apply to every hero on your roster rather than a single unit, directing currency toward offensive breakpoints yields far greater progression than spreading materials across low-impact defensive tracks.

Node Investment Priority Order

Late-game combat heavily favors burst damage and initiative over prolonged attrition. Spend your upgrade currency according to the following order:

Priority	Category	Key Stats Granted	Primary Purpose
1	Speed & Initiative	Flat Speed	Securing turn order in PvP and Void Campaign
2	Direct Offense	Attack %, Holy Damage, All Damage Dealt	Amplifying carry active skills and clearing bosses
3	Critical Scaling	Crit Rate, Crit Damage, Armor Break	Scaling burst carries such as Aspen and Vulcan
4	Survivability	Flat HP, Damage Reduction, Block	Surviving incoming damage when offensive pushing stalls

Speed represents the most critical stat in high-end Void Campaign and PvP because it lets your primary crowd-control and support heroes act before enemy waves can apply energy drain or disabling status effects. Once those Speed thresholds are secured, percentage-based offensive multipliers provide the largest relative jump in power by scaling off your heroes' high base attributes and advanced gear.

Managing Branch Milestones and Upgrade Costs

Each tier within a Grimoire track requires exponentially more materials than the previous tier. Dumping all resources into a single branch eventually hits diminishing returns, where a tiny stat gain costs weeks or months of saved currency.

To prevent stalling, balance your milestone pushes with cost-effective horizontal pickups:

Target the nearest Speed milestone: Route through the shortest path required to get your core setup acting ahead of target enemy waves.
Push core offensive multipliers: Continue along that branch until you unlock its major percentage Attack or All Damage Dealt capstone.
Harvest cheap base stats: When the next node on your primary track becomes prohibitively expensive, purchase low-cost introductory nodes on secondary branches for quick, flat Attack and HP increases.
Reserve deep defensive paths for bottlenecks: Do not invest heavily in high-tier survivability tracks unless your squad consistently fails survival checks despite dealing sufficient damage.

Why Saving for Bulk Upgrades Works

Grimoire upgrade materials, such as those earned from Force War and guild-level activities, accumulate slowly through time gates. Spending these currencies incrementally often produces minor flat HP or stat boosts that fail to change combat outcomes in difficult stages.

Stockpiling materials over months-long saving cycles allows you to leap across multiple node tiers in a single session. This bulk approach lets you instantly clear entire Speed brackets and percentage damage thresholds. Reaching those milestone nodes in one burst creates immediate account breakthroughs, unlocking higher reward tiers across Void Campaign and passive progression modes without wasted spending along unfinished paths.