In the Roblox card-based strategy experience Periastron Tower Defense (developed by Periastron Champions), Cosmic represents one of the highest unit rarity tiers available. Cosmic units provide unique summoning and offensive traits, but they require significant crate grinding with either gold or shards to unlock.
How to Get Cosmic Units
Cosmic tier units are unlocked through the game's crate summoning system. Players acquire them via standard shop crates or dedicated currency crates in the lobby.
- Fragmented Crates: Purchased with shards or runes in the rune shop. Fragmented Crates feature a base 1% drop chance for a Cosmic unit.
- Crate of Nature: Purchased in bulk with standard gold. Player tests show Cosmics can also be pulled here through the pity counter, though specific raw percentages are not explicitly displayed on the purchase prompt.
To boost your odds and rolling efficiency, the game offers several premium passes:
- 1.3x Luck (299 Robux): Increases pull luck by +30%.
- VIP (319 Robux): Grants a 20% discount on box purchases, alongside bonus EXP and AFK rewards.
- 1.5x Shards (399 Robux): Multiplies shard earnings by 1.5x, speeding up access to Fragmented Crates.
Cosmic Unit Showcase: Necromancer
The Necromancer is a prominent Cosmic unit in Periastron Tower Defense. Unlike direct attackers that rely purely on projectile blasts, the Necromancer features summoning mechanics that send spawned allies along the path to engage kingdom waves.
Maxed Necromancer Combat Stats
When upgraded to its maximum tier during a match, player gameplay showcases confirm the following performance attributes:
| Stat Attribute | Max Upgrade Value |
|---|---|
| Rarity | Cosmic |
| Damage | 30 |
| Range | 14 |
| Cooldown | 1.17s |
| Special Trait | Spawns allied minion units |
Combat Performance and Team Synergy
While the maxed Necromancer boasts a low 1.17-second attack interval and lane-blocking summons, testing on maps like Mount Volcano (Medium difficulty) reveals that it cannot comfortably solo-carry mid-to-late waves alone.
When played without support, summoned minions struggle to out-damage heavy boss HP pools before enemies slip past the defense line. For optimal stability, the Necromancer should be deployed alongside high-DPS single-target towers (such as Pyrie) to soften oncoming threats while the spawned units intercept the frontline.
Frequently Asked Questions
What is the exact drop rate for a Cosmic unit in Fragmented Crates?
In the Fragmented Crate, Cosmics have a 1% base drop rate.
Can the Necromancer solo Mount Volcano on Medium?
In recorded gameplay tests, a fully maxed Necromancer was unable to defeat the final boss on Mount Volcano Medium by itself after selling off early-game defense units. It requires supplementary attackers like Pyrie to clear tankier targets.
Where do you spend shards for Cosmics?
Shards (or runes) are redeemed in the lobby's dedicated rune shop, where you can buy Fragmented Crates.
