That would be cool if it works. One of my big problems with using the terror anoint is that I need to use a Facepuncher to get terror consistently, which means I need to use a weapon slot just for terror generation and still lose another slot of ASE elemental damage. If we can use the relic to proc terror then it would be a tremendous QoL change.
The way I’m envisioning a terror pet build would be a chance to terror on melee, Attack command anoint on shield or grenade, and the 90% crit damage anoint or the 50% cryo damage on the other if possible. That way, your pet has 2 elements from Gamma Burst and Terror, and FL4K has extra radiation damage with either extra crit while terrified, or cryo which shores up radiation’s weakness to armor.
My preliminary napkin math is showing that with about 300% of pet damage and no class mod, the pet should be able to hit about 22k per melee hit with both terror and GB (assuming scorcher). I have no idea what the health pools for level 57 enemies is like yet, so it remains to be seen how good that will actually be. Still, it’s exciting nonetheless.