Obsidian Spike-nut
Purpose-built for the rigours of Odyssey mode, Obsidian Spike-nut is an Odyssey fusion whose combined parent-plant abilities give it the edge needed to survive the game's most challenging wave sequences.
Combat Stats
Damage
100 (biters)
Toughness
16000
Details
While requires as basis, it functions more like an upgraded .
16000 Toughness, is anti-crush (repels vehicles back 0.5 tiles and takes 500 damage each time), and takes no more than 1000 damage per hit. also has a higher Toughness regeneration amount than , recovering 1500 Toughness every 15 seconds instead of 500.
When a zombie bites , will deal 100 damage back to the zombie, similarly to .
Also like , can puncture tires. Each time a tire is punctured, 500 Toughness will be deducted from itself and if the zombie survives, is repelled 0.5 tiles.
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 1/6, 1/9, and 1/12 of their max Toughness respectively.
Pros
- Exceptional toughness — 16000 durability absorbs an enormous amount of damage before breaking.
- Amplifies backline damage — Stalling zombies gives offensive plants more total attacks before threat elimination.
- Broadly applicable — Works as a defensive anchor in virtually any level type or zombie set.
Cons
- Minimal active damage — 100 (biters) is not enough to clear zombies without dedicated damage plants behind it.
- Bypassed by specials — Aerial, burrowing, and vaulting zombies circumvent its blocking entirely.
- Passive dependency — Requires correct pre-placement; cannot reposition once zombies are in lane.
1
Column 3 gives zombies the farthest stall distance from the lawn exit — plant Obsidian Spike-nut there whenever possible.
2
Pair with an Aloe or healing variant behind it to sustainably repair Obsidian Spike-nut's toughness across long wave sequences.
3
Keep a duplicate in your planting queue so that when Obsidian Spike-nut falls you can immediately replant without a defensive gap.
4
Address flying and vaulting zombies with separate lane-appropriate plants — Obsidian Spike-nut cannot block them.
What is Obsidian Spike-nut in Plants vs Zombies Fusion?
Obsidian Spike-nut 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 Spike-nut cost?
Obsidian Spike-nut 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 Spike-nut target?
Obsidian Spike-nut focuses its attacks on all 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 Spike-nut compared to other fusions?
Obsidian Spike-nut has 16000 toughness, which places it among the toughest defensive plants in its class. Pair it with a healing plant or defensive buffer to extend its operational lifespan across multiple consecutive waves.
