What stats/buffs increase the effectiveness of monster helms?

relentless_turnip

My specific example is:

I run succession and grothdarr and it doesn't seem as if succession improves it's tooltip. Max magicka and spell damage don't seem to impact it either...
Is it only berserk and other buffs that increase it?
I also am aware that Elf bane will increase its duration, is there anyway to buff the damage though?

ku5h

Spinner's / Spriggan's will indirectly buff your Grothdarr since enemy armor cut into your tooltip dmg.

RaptorRodeoGod

CPs are the way to boost proc set damage for the most part. A couple sets will too, like Deadly Strikes. Adding max magicka/stamina or spell/weapon damage will not buff proc sets. Adding physical/spell penetration increases the damage, but it is not reflected in the set description.

MudcrabAttack

Thaumaturge or Master At Arms - depending on damage type
Mighty or Elemental Expert - depending on damage type
Individual elemental damage multiplier buffs
Single target type monster damage from Flame Staff or AOE monster damage from Lightning Staff
Swords from 2-H or Dual Wield weapon line
Physical or Spell Penetration
Major or Minor Vulnerability
Major or Minor Berserk
Major or Minor Slayer inside dungeons
Bloodthirsty
Soul Harvest / Incapacitating Strike
And the already mentioned sets like elfbane and deadly strikes
Sorc pet multiplier I think...
Necromancer DOT Buff

Altyrann

Basically anything other than stam/mag, WD/SD, crit chance or crit bonus damage.

relentless_turnip

Thank you both for you help 😁