Defensive Crystals are secondary arms that appear on the second equipment page of your Hero.
They typically possess 1-8 buffs that raise scroll damage as well as provide small bonuses to your Hero's base stats. They are obtained from the Tower of Babel.
| Item | Arena Rank | Level | ATK | DEF | SPD | INT | Sale Price |
| Sergeant's Defensive Crystal | Master Sergeant | 10 | 0 | 2 | 1 | 0 | 100 |
| Lieutenant's Defensive Crystal | Captain | 30 | 0 | 4 | 2 | 0 | 100 |
| Colonel's Defensive Crystal | Colonel | 50 | 0 | 7 | 2 | 0 | 100 |