Obsidian Spikerock
, also known as Spikesidian, is a fusion plant.
Combat Stats
Damage
300 × 2
Attack Speed
1 Second
Range
Contact
Target
Ground Zombies
Toughness
8000
Details
functions similarly to , but deals 300 damage per attack instead of 20.
Additionally, every 15 seconds, regenerates 500 Toughness.
Like , only takes 50 damage from s / vehicles, 150 damage from s, and deals the following damage against vehicles:
Instantly kills s and s.
If or has more than 50% max Toughness, damage is capped at 50% of their max Toughness
If , , or has more than 1 / 3 of their max Toughness, damage is capped at 1 / 3 of their max Toughness.Note:
, , and have innate 50%, 66%, and 75% damage reductions respectively, effectively capping damage at ⅙, ⅑, and ⅟₁₂ of their max Toughness respectively.
As a fusion plant, doesn’t block regular zombies, allowing them to walk over itself without being eaten. also cannot be damaged by straight-shooting projectiles such as those fired from or .
Pros
- Consistent lane coverage — 300 × 2 every fires every 1 Second keeps steady pressure on the zombie approach path.
- Broad applicability — No specialized condition needed; works in virtually every level type.
- Fusion value — Parent-plant combination creates a stronger attack profile than either plant alone.
Cons
- Generalist ceiling — Lacks the peak power spike of specialist fusions in their ideal conditions.
- Protective dependency — 8000 requires wall support to reliably fire for multiple full waves.
- Outpaced in endgame — Specialist fusions eventually outperform Obsidian Spikerock in the scenarios they were designed for.
1
Assign Obsidian Spikerock to your primary zombie lane each level for maximum attack-cycle utilization throughout the run.
2
A single wall plant in front keeps Obsidian Spikerock safely firing from a protected position across multiple wave cycles.
3
Check the active Lumos level bonuses — if any match Obsidian Spikerock's attack type, the multiplier can dramatically increase its effective DPS.
4
Refresh your knowledge of Obsidian Spikerock's recipe before long sessions — replanting mid-wave requires knowing the parent plants instantly.
What is Obsidian Spikerock in Plants vs Zombies Fusion?
Obsidian Spikerock is a Odyssey fusion plant created by combining two base plants in Plants vs Zombies Fusion. It is exclusive to Odyssey mode, where its enhanced performance matches the elevated difficulty of Odyssey encounters.
What does Obsidian Spikerock cost?
Obsidian Spikerock carries no standard sun cost because it is an Odyssey-exclusive fusion, unlocked through Odyssey mode progression rather than sun spending.
Which zombies does Obsidian Spikerock target?
Obsidian Spikerock focuses its attacks on Ground Zombies zombies. Use this knowledge to pre-assign it to whichever lane or row contains the highest concentration of those zombie types in each level.
How tough is Obsidian Spikerock compared to other fusions?
Obsidian Spikerock has 8000 toughness, which places it in the mid-range of the fusion toughness scale. Pair it with a healing plant or defensive buffer to extend its operational lifespan across multiple consecutive waves.
