Tentacle Spike
| Rank | Effect | Flavor |
| 1 | Adds damage to auxiliary tentacle slap. | One of your tentacles bears a spike. |
| 2 | Adds more damage to auxiliary tentacle slap. | One of your tentacles bears a nasty spike. |
| 3 | Adds most damage to auxiliary tentacle slap. | One of your tentacles bears a large vicious spike. |
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Damage: | ||
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Species notes: Exclusive to octopodes. Octopodes may also temporarily induce rank 3 of this mutation with Beastly Appendage. | ||