How do you remove the requirement to be behind the target for the spell Shred for druids and Backstab for Rogues. I have tested it with the stoneharry spell editor and unchecked / checked facingFront without any results. I have reviewed all 3 effects + flags in the editor and nothing points to behind the target.
Furthermore I have deleted the entry on all ranks for Shred and Backstab in table spell_custom_attr with attributes 131072... but the spells Shred and Backstab still don't work when in front of the mob.
Did anyone get any tips?
There is a custom attribute called SPELL_ATTR0_CU_REQ_CASTER_BEHIND_TARGET that is applied to the spells that require the player to be behind the target to successfully cast the spell. You can find this in SpellMgr.cpp on line 3119-3179 where the spells Backstab and Shred are defined to have the flag applied.
Removing the spellid's from this switch statement should resolve your issue.