GS Companion
Fallen Foxhelm

Fallen Foxhelm

3★ DEF Thanatos

Skill

40–46s CT - For 12s, all allies gain a DMG barrier that negates 525–750 DMG.

Numbers in a range are rolled when the equip is crafted.

Crafting

Fusion Type
Thanatos: a Thanatos Glyph raises the chance
Extra effects
0–2 at random: ATK UP, HP Recovery UP, Skill CT Speed UP, Break Power UP, CRI rate UP, Accuracy UP, Arts UP, BE Output UP, PHY DMG UP, MAG DMG UP, Status ailment RES UP
Passive
3 of the same Crest Fragment can add that Crest's effect

Other 3★ DEF Fusion Equips

Lavender Shield
3★ DEF Dominion

40–46s CT - For 12s, increase target's PHY RES or MAG RES by 25–35%.

Arian Plates
3★ DEF Vital

40–46s CT - For 12s, increase allies' ◯ Element RES by 14–20%.

Data from the Grand Crusade Guide by jeffers and .phex (Grand Summoners Official Discord).