What are the ways to increase the maximum as possible the poison and disease damage from the bow skill line? I mean armor sets, weapon enchants, everything that would increment those damages.
Morag tong set is a great way to increase poison damage for yourself and anyone else attacking the same enemy. It definitely makes the stam DPS best support sets list (along with Night Mothers Gaze, Sunderflame, Alkosh, War Machine, and Powerful Assault).
Swamp raider set increases poison and disease damage, but requires use of a damage-dealing Magicka-costing ability every 10s (like flames of oblivion on stamDK).
Edited by WrathOfInnos on December 15, 2017 3:42PM
Another good addition would be the master's bow. It doesn't increase the damage dealt by poison abilities, but increases weapon dmg by 300 against targets affected by poison arrow.