Thunderwave Sword is an unmissable Act 2 story weapon: during the Lightning Stone objective, follow the route to the golem room, defeat the mandatory elite golem, and you receive Thunderwave Sword alongside the Lightning Stone.
Minor Act 2 spoilers: this route is tied to main story progression in Beast of Reincarnation. The good news is that you are not farming a rare drop; you are waiting for the right story checkpoint, then clearing one short elite encounter. Get it before the late Act 2 boss sequence and it can carry harder than its base Attack suggests.
- Thunderwave Sword timing and missability
- Thunderwave Sword stats and timing
- How to get Thunderwave Sword after the elite golem encounter in Beast of Reincarnation
- Elite Enemy Golem fight tactics
- Thunderwave Sword’s Tempest damage value
- Thunderwave Sword upgrade costs and replacement timing
- Frequently Asked Questions
Thunderwave Sword timing and missability
Thunderwave Sword becomes available in Act 2, around the middle of the act, once the story sends Emma after the Lightning Stone. The route runs through the Ancient Civilization Zone on the Mountain Area side of the story path.
KEY!
The reward comes from the mandatory Elite Enemy Golem encounter during the Lightning Stone objective. You cannot permanently lose the sword by exploring first, and it is not an optional side-quest prize.
Thunderwave Sword stats and timing
| Stat | Value |
|---|---|
| Weapon type | Sword |
| Element | Electric |
| Base Attack | 21 |
| Lightning Buildup | 12 |
| Ability | Tempest |
| Tempest effect | Each slash calls down lightning on nearby foes and adds +3 Lightning buildup for 5 seconds |
| Story timing | Middle of Act 2, during the Lightning Stone objective |
| Main use | AoE pressure, Shock buildup, and Lightning-weak bosses |
The easiest way to recognize the right weapon is its Tempest identity. This is a Lightning sword built around extra elemental pressure, not a high-raw-damage stat stick.
How to get Thunderwave Sword after the elite golem encounter in Beast of Reincarnation
This route starts once the Act 2 story points you toward the Lightning Stone and ends with the mandatory golem reward fight.
STEP 1/9
Reach the post-encounter Act 2 point
Continue the story until Emma is tasked with finding the Lightning Stone and the route leads to the mandatory elite golem encounter.
STEP 2/9
Start from the central map position
Use the middle Act 2 map position as your starting point for the objective route.
STEP 3/9
Track the Lightning Stone objective
Follow the Lightning Stone objective instead of looking for a side quest marker.
STEP 4/9
Enter the target room
Head into the objective room around the Collapsed Riverbank Front / reservoir route, where the elite golem blocks progress.
STEP 5/9
Let the cutscene trigger
The cutscene marks the start of the mandatory fight.
STEP 6/9
Pressure the golem
Stay close and attack often, because the robot-like golem is slow enough to punish between swings.
STEP 7/9
Parry repeated hits
Parry frequently to keep the fight fast and avoid taking heavy counterattacks.
STEP 8/9
Take the Lightning Stone
The Lightning Stone becomes yours when the mandatory fight ends.
STEP 9/9
Claim Thunderwave Sword
Thunderwave Sword is awarded alongside the Lightning Stone at the end of the same encounter.
Video help
Elite Enemy Golem fight tactics
The mandatory Elite Enemy Golem, also shorthanded as Agile Golem, is slow but punishes passive play. If you back away and wait for huge openings, you stretch a short story gate into a longer fight and give it more chances to land heavy swings.
Stay engaged, swing after its recovery, and make parries your main answer to incoming attacks. The point is not to solve a boss puzzle; it is to keep pressure high enough that the golem falls quickly and the Lightning Stone reward chain finishes.
Thunderwave Sword’s Tempest damage value
Tempest turns Thunderwave Sword from a modest-raw-stat sword into one of the best early Lightning picks. Each slash can bring extra Lightning hits onto nearby enemies, so your normal offense also builds toward Shock instead of depending only on the weapon’s base Attack.
That makes it especially useful in crowded rooms, where the added strikes help control space while you keep swinging. Against Lightning-weak bosses, including Lacerta, the same buildup gives you a cleaner damage plan than simply equipping a harder-hitting neutral sword.
Thunderwave Sword upgrade costs and replacement timing
| Upgrade | Cost |
|---|---|
| Attack 28 | 1000 Amber |
| Attack 36 | 3200 Amber |
| Attack 45 | 5800 Amber |
The early Amber upgrades are worth considering because the sword gains clear Attack jumps without asking for a late-game investment. The values below are the early breakpoints that matter most while you are still using it as an Act 2 progression weapon.
For later ranks, read the in-game upgrade screen before committing more Amber, because higher Tempest-rank Lightning buildup values can differ by version. Higher-end Lightning weapons may replace it later, but these early upgrades are the window where Thunderwave Sword gives the most return for Act 2.
Upgrade Thunderwave Sword before the late Act 2 boss sequence; the raw Attack jumps pair well with Tempest’s Lightning pressure while the weapon is at its strongest point in progression.
Related Beast of Reincarnation guides
Frequently Asked Questions
Can you miss Thunderwave Sword if you already visited the room earlier?
No. If the room was empty before the Lightning Stone objective, you were there too early; the encounter appears when the Act 2 story state is active.
Is Thunderwave Sword a random drop?
No. The golem fight has no farming loop attached to it; beating that story gate gives the weapon and moves the Lightning Stone objective forward.
Should you keep using Thunderwave Sword after Act 2?
Keep it while your build benefits from Lightning strikes, AoE pressure, and Shock buildup. Replace it once a later weapon gives your setup better damage or stronger utility.
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