Hollowborn Reaper's Scythe (40% Damage to All), Hollowborn DragonSlayer's Blade (60% Damage to Dragons).
Member + Non-Mem
AcceptKasebel's "Flex it!" and "Get the Seeds" quests from /shadowrealm (walk right>up>up to find her). Then go back to the start of the map then top-left to farm the Gargrowl and Shadow Guardian. Also make sure to enable Quest Log Turn-Ins and Reaccept Quest After Turn-In from Advanced Options. This way you can keep your Quest Log open and turn in quests from there. You can access your Quest Log by pressing L.