Relics Guide: Builds & Slots

Use this Booster Pack Heroes relics guide to plan relic slots, pack timing, and build combos that support your heroes and tower defense.

How the Booster Pack Heroes Relics Guide Fits a Run

Relics are the quiet difference between a clean tower defense and a run that collapses under a boss push. This Booster Pack Heroes relics guide focuses on the decisions that matter: when to open relic packs, how to unlock extra slots, and which effects deserve a place in your build. If you are still treating relics as background loot, this Booster Pack Heroes relics guide will show why they should shape your pack purchases and upgrade plan.

In Booster Pack Heroes, you buy booster packs, open them during battle, summon heroes and spells, and defend your tower while earning Mastery for permanent upgrades. Relics sit on top of that loop. The full game includes 40 relic types, and they can change spawn odds, add combat effects, or strengthen a specific hero tag. A relic build is not a cosmetic choice; it is a second layer of strategy that tells your collection what to do. The broader relic builds and chapter modifiers system is worth understanding before you spend a long run chasing the wrong effect.

System piece	What it does	Why it matters
40 relic types	The full game includes 40 relics that can be equipped and combined.	You are not meant to use one universal relic; build variety is real.
Relic packs	Add relic rewards during a run.	They compete with hero-pack purchases for attention and timing.
Equip step	Click a relic to equip it.	The effect is not automatic until you place it.
Additional slots	When the Relics menu shows the requirement, destroying 1 relic unlocks another equipment slot.	Slot growth requires a sacrifice decision, not just more loot.
Greater Relic Pack	An additional relic-pack type unlocked during progression.	Later runs add another relic-pack type to watch for.
Chapter modifiers	10 modifier types add buffs or debuffs to chapters.	A relic build must survive the chapter rules, not just the base map.

Booster Pack Heroes Relics Guide: Pack Timing and Slot Management

A practical Booster Pack Heroes relics guide should start with timing, because a relic is only as good as the board it lands on. Relic packs are separate from hero packs. You still need booster packs to put units on the field, but relic packs are what push a lineup from “working” to “built.” Opening a relic pack before you commit heavily to one hero tag can save you from over-investing in a lane the relic does not support.

Slot management is the part most players underestimate. The game can show an additional-slot requirement in the Relics menu, and destroying one relic unlocks another equipment slot. That makes weak or off-build relics useful as fuel. Do not hoard every relic just because it has text; if the slot requirement is active and you need room, cut the effect that does not match your warriors, hunters, mystics, or rare heroes.

The Booster Pack Heroes relics guide approach is especially important in Act 2, where foil bosses and Iron Legion waves can spike pressure before your board is ready. Defensive or summon-based relics help you survive those pushes, while pure economy relics are better when your board can already hold the line.

Run moment	Relic decision	Reason
Early run, hero pool still flexible	Open a relic pack before spending heavily on one tag.	Spawn-odds relics can redirect your best purchases.
Before a boss push	Keep at least one defensive or summon effect if your board is fragile.	Boss fights and Iron Legion waves punish slow starts.
Slot requirement appears	Destroy one low-synergy relic if the menu asks for it.	That is the supported way to open another equipment slot.
Shop discount appears	Consider the discount relic if you still need packs or upgrades.	Economy effects compound only if you can use the savings.
Mystic or rare core is online	Favor revive, electrify, or chain lightning.	These effects match the tags you are already fielding.

Which Relic Effects Deserve a Slot?

The strongest relic is not the one with the flashiest text; it is the one that matches the units you can actually field. A warrior duplication relic is wasted if your board is mostly mystics. A chain lightning relic needs rare heroes to show up often enough to matter. Use this Booster Pack Heroes relics guide as a filter: check the hero tag first, then check whether the effect fixes a real problem in your run.

Relic effect	Supported behavior	Best fit	Caution
Warrior pressure	Warriors are more likely to appear; the first two warriors that spawn can be duplicated.	Warrior-heavy boards	Does nothing if you are not buying warriors.
Rare lightning	Rare heroes are more likely; attacks can cast electrify/chain lightning.	Rare-hero cores	Needs rare heroes to actually appear.
Hunter focus	Hunters are more likely to appear.	Hunter spawn builds	Narrow if your shop is not producing hunters.
Mystic sustain	Mystics are more likely; spawned mystics gain revive.	Grindy fights	Revive is not a substitute for damage.
Block chance	All heroes gain block chance.	Fragile boards	Defensive only; pair it with a damage engine.
Thunderbolt damage	Increases thunderbolt damage.	Lightning-heavy runs	Weak if you do not use thunder effects.
Discount	Adds a discount effect during the run.	Economy-heavy runs	Do not skip a needed combat relic for savings.
Skeleton and lightning summons	Adds skeleton and lightning summons.	Extra board presence	Summons can clutter; keep upgrades focused.

Your situation	Prioritize	Why	Avoid
Warrior collection online	Warrior duplication, block chance	More bodies and better survival	Mystic-only effects
Rare hero core	Chain lightning/electrify, thunderbolt	Area damage and spell synergy	Hunter spawn if you field no hunters
Mystic core	Mystic revive, block chance	Sustain through long fights	Duplication for tags you do not buy
Fragile board	Block chance, summons	Absorb pressure	Pure economy when a boss is next
Thin shop economy	Discount	Stretch purchases	Overbuilding around savings
Act 2 boss pressure	Defense plus one damage engine	Foil bosses and Iron Legion demand balance	Splitting across three tags

Relic Build Templates for Real Runs

Use one main engine and one survival or utility effect. That rule keeps your relic slots from becoming a museum of almost-useful text. If your relics push warriors, buy and upgrade around warriors. If they push rare heroes, let chain lightning and thunderbolt do the work. If they push mystics, revive effects can turn a losing grind into a slow win.

Build	Core relic effects	Support	Play pattern	Risk
Warrior swarm	Warrior duplication	Block chance, discount	Flood warriors, then upgrade the strongest	Weak if the shop withholds warriors
Rare lightning	Rare appearance, chain lightning/electrify	Thunderbolt damage	Let rare heroes chain-clear packs	Needs rare heroes online
Mystic grind	Mystic appearance, revive	Block chance, summon effect	Outlast pushes with revived mystics	Low burst if revive stalls
Defensive summon	Skeleton/lightning summons	Block chance, thunderbolt	Use summons to protect damage dealers	Board clutter if upgrades spread
Economy flex	Discount	Any one combat engine	Buy more packs and upgrades, then pivot	Greedy if a boss arrives early

The best Booster Pack Heroes relics guide advice is to reassess after every boss. A relic that carried Act 1 may not answer the foil bosses and heavier waves in Act 2. Keep your slots flexible enough to swap in block chance, revive, or summons when the next chapter starts punishing your damage-only setup.

Common Relic Mistakes and Fixes

Mistake	Why it hurts	Fix
Treating relics as optional	You lose spawn odds and combat modifiers	Open relic packs when your build is still flexible
Equipping without checking hero tags	Effects do nothing for your board	Match relics to warriors, hunters, mystics, or rare heroes
Hoarding every relic	Slot growth can require destroying one relic	Keep one weak relic as the sacrifice when the menu asks
Ignoring chapter modifiers	A build can fail before relics matter	Check the 10 modifier types before locking a plan
Splitting across too many tags	No effect reaches critical mass	Choose one main engine and one survival effect
Skipping defense before a boss	Damage alone can collapse	Keep block, revive, or summons available

Check the Relics menu before buying another pack so you know whether you need power or slot space.
Pair spawn-odds relics with the heroes you are already upgrading, not with a fantasy board you cannot afford.
Use discounts and economy relics when your board is stable; use defense when the next boss is the real threat.
Treat the destruction requirement as a feature: one weak relic can open a slot for a build-defining effect.

FAQ

How many relics are in Booster Pack Heroes?

The full game includes 40 relic types. You can equip and combine them, and additional relic-pack types appear during progression.

How do I unlock another relic slot?

When the Relics menu displays the additional-slot requirement, destroy 1 relic to unlock another equipment slot. Treat that sacrifice as part of build planning rather than an accident.

What should a Booster Pack Heroes relics guide prioritize?

A Booster Pack Heroes relics guide should match relics to the hero tags you can actually field. Warrior duplication, rare chain lightning, mystic revive, block chance, and discounts are all documented effects, but each one needs the right board.

Do relic packs replace booster packs?

No. Booster packs supply heroes and spells, while relic packs add relics to your run. You still need to buy and open packs during battle to keep units on the field.