Bad Iv Hrid worth using or fodder?

i fodder my Hrid was IV +spd -att to the GOD Surtr

This is probably buried in the third page by now so here's a link
https://fireemblem.gamepress.gg/q-a/i-pulled-hrid-what-do-i-do

If you have an extra Hrid, then he might be good fodder for someone else, but keep him around for a bit. If you team him up with units like Gunnthra, Aversa, or Loki who have global/near global debuffs, then Hrid has an "omni breaker" effect which doubles his damage output. You can also use low cool down special like glimmer to give him more frequent burst damage.

Also, Hrid's weapon effect is active on BOTH phases, so debuffed enemies will never be able to make follow up attacks on him without some special skill support i.e. double quick riposte, etc.

Finally, he's going to be harder to damage with a def boon, so why not gear him towards being an enemy phase bait & counter kill unit?

You should still use Hrid. Even with a -atk he still has 53 attack and considering his omnibreaker weapon, he still kills a lot of people. Also def boon is really good so you should keep Hrid for this reason as well.