Shell Crusher

Weapon Skill Information
Description:	Lowers target's defense. Duration of effect varies with TP.
Weapon Type:	Staff (175 Skill)	Target:	Single
Class:	Physical
Stat Modifier:	100% STR	fTP:	1.0
TP Modifier	1000 TP	2000 TP	3000 TP
Effect duration:	180 seconds	360 seconds	540 seconds
Skillchain:	Detonation
Command:	/ws "Shell Crusher" <stnpc>
Job Level Information
Level	Jobs
55	PLD
56	WAR, MNK, BLM, DRG, SMN
57	WHM, BRD, SCH, GEO

Notes

• Defense Down effect is -25% defense.
  • Additional Effect is -based, so it is unlikely to land on or enemies.
  • Duration has three resist states, so "unresisted duration" is shown above, "resisted duration" is half of that, and it is possible for the monster to fully resist.
    • Duration scales continuously with TP, i.e. 1500 TP unresisted duration is 270 seconds.
• Accuracy of WS additional effect has increased June 2017 SE official
• Defense Down effects do not stack with each other.
  • Dia, Box Step, Defense Down, and Geo-Frailty all stack together.
  • Defense Down effects such as Acid Bolts, Angon, Spirit Surged Jumps, Tachi: Ageha, Full Break, Shell Crusher, Tenebral Crush, Sweeping Gouge, Tourbillion, and Frightful Roar, etc do not stack. Only one may be active at a time.
    
    
    

References

• Studio Gobli's WS page (Studio Gobli)
• Shell Crusher durations (CDF, BG)