Periastron Tower Defense coin spending centers on buying unit crates from the lobby shop to expand your deck with new towers. Players spend earned gold on boxes such as the Crate of Beginnings and Crate of Nature, while managing in-match cash separately to place and upgrade active units on the battlefield. Because different crates handle Legendary and Cosmic pity counters differently, allocating your coins to the right crate tier is essential for unlocking high-rarity units.
Lobby Crates and the Pity System
The main permanent sink for coins (also referred to as gold in-game) is the lobby crate shop. Opening crates unlocks unit cards of varying rarities, from basic defenders like Slashers to high-tier units like Necromancer and Bonfire.
When spending coins on crates, players must consider the game's pity rules:
- Crate of Beginnings: The starter crate costs 50 coins. According to in-game update notes, the Crate of Beginnings does not count towards the Cosmic and Legendary pity counter. Buying this crate is useful for building an initial roster, but it does not advance pity for top-tier cards.
- Crate of Nature: A standard coin crate that players purchase in bulk with accumulated gold. Opening these crates contributes toward higher rarity rolls.
- Fragmented Crates: Higher-tier crates featured alongside Crate of Nature. Fragmented crates feature a 1% base chance for Cosmic rarity units.
| Crate Name | Primary Currency | Pity Contribution | Notable Unit Drops / Rarities |
|---|---|---|---|
| Crate of Beginnings | Coins (50 per crate) | Excluded from Cosmic & Legendary pity | Starter units, Frostion Sword, Slasher |
| Crate of Nature | Coins / Gold | Advances crate pity system | Standard roster units, rare card variants |
| Fragmented Crate | Shards / Runes | Advances Cosmic pity (1% Cosmic base rate) | High-tier and Cosmic units (e.g., Necromancer) |
In-Match Economy vs. Lobby Gold
Periastron Tower Defense maintains a strict split between account-level progression currency and tactical battle currency:
- Lobby Coins (Gold): Kept permanently in your wallet. Coins are earned from winning matches, AFK farming, and redeemable update codes. They cannot be spent mid-game to save a failing run.
- In-Match Cash: Temporary funds generated wave-by-wave during a match. Players spend this cash to place equipped deck cards onto the field (such as Pyrie, Slingshooter, Rocket, or Subspace Trip Miner) and pay for level upgrades. When a unit is placed, leveling it to max increases damage and attack frequency, but this money resets entirely once the match concludes.
How to Earn Coins Efficiently
Funding crate spending sprees requires consistent coin farming across available game modes:
- Mode Completions: Standard matches on maps like Farm or Mount Volcano award coins upon clearing or wave completion. Medium difficulty runs award between 90 and 225 gold depending on wave depth and victory status.
- AFK World: The dedicated AFK zone awards 200 coins every 300 seconds (5 minutes) of idle time, providing a passive method to stock up between active matches.
- Promotional Codes: Update releases periodically provide flat coin injections. For example, early release and update codes provided 500 coins and 3 shards directly to the player's balance.
- Store Passes: Players looking to accelerate coin acquisition can purchase optional Robux passes on the official Roblox page. The 2x Coins pass costs 399 Robux and permanently doubles coin gain, while the VIP pass costs 319 Robux, offering a 20% discount on boxes along with 10% bonus AFK rewards and 25% bonus experience.
Periastron Tower Defense Coin Spending FAQ
Does opening Crate of Beginnings build Cosmic pity?
No. In-game update details confirm that the Crate of Beginnings does not count towards the Cosmic and Legendary pity count. If your goal is to trigger guaranteed Cosmic pity thresholds, spend your coins on Crate of Nature or higher-tier crates.
Can coins be used to buy items in the Rune Shop?
No. The Rune Shop operates on shards and runes gathered from matches and special drops rather than standard gold. Crates and boosts in that section require dedicated rune balances.
Do in-match upgrades cost coins from your lobby inventory?
No. Upgrading towers in combat uses temporary in-match cash earned from defeating enemies and clearing waves. Your stored coin balance in the lobby remains untouched during battle.
