I might be wrong, but I think gruesome just wiped out our two strongest members...without batting an eye! 
Appearing in "The Fall of Avalon"
Featured Characters:
- Avengers (Main story and recap)
- ⏴ Thor (Odinson) ⏵ (Main story and recap)
- ⏴ Captain America (Steve Rogers) ⏵ (Main story and recap)
- ⏴ Iron Man (Tony Stark) ⏵ (Main story and recap)
- ⏴ Wasp (Janet Van Dyne) ⏵
- ⏴ Hawkeye (Clint Barton) ⏵ (Main story and recap)
- ⏴ She-Hulk (Jen Walters) ⏵
Supporting Characters:
- ⏴ Doctor Druid (Anthony Druid) ⏵
- ⏴ Black Knight (Dane Whitman) ⏵ (Main story and recap)
- Amergin (First appearance) (Main story and flashback)
Antagonists:
- Fomor (First appearance)
Other Characters:
- Odin (Invoked)
- Valinor
- Hulk (Bruce Banner) (Only in recap)
- Quicksilver (Pietro Maximoff) (Only in recap)
- Scarlet Witch (Wanda Maximoff) (Only in recap)
- Swordsman (Jacques DuQuesne) (Only in recap)
- Vision (Only in recap)
- Aragorn (Only in recap)
- Enchantress (Amora) (Only in recap)
Races and Species:
- Humans (Main story and recap)
- Asgardians (Main story and recap)
- Synthezoids (Only in recap)
- Horses (Only in recap)
- Fomor (First appearance)
- Fomorian-Tuatha de Danaan Hybrids (First appearance)
Locations:
- Earth
- Otherworld (Main story and flashback)
- Avalon (Main story and flashback)
- Halls of Avalon (Main story and flashback)
- Amergin's Tower (First appearance)
- Western Sea (Referenced)
- Dark Realm (Mentioned)
- Avalon (Main story and flashback)
Items:
- Mjolnir
- Captain America's Shield
- Hawkeye's Bow and Trick Arrows
- Bio-Synthetic Wings
- Iron Man Armor Model 4
- Iron Man Armor Model 3 (Only in recap)
- Evil Eye
- Ebony Blade
Synopsis for "The Fall of Avalon"
Dr. Druid suddenly appears at an Avengers meeting and transports all but Iron Man, whom his magic cannot affect, to 12th century Avalon, where they find their former teammate, the Black Knight. Amergin, the wizard-ruler of Avalon and Dr. Druid's ancestor, explains that the extradimensional isle is the last line of defense between Earth and the realm of the monstrous Fomor, and that their aid is desperately needed. Before the heroes can plot strategy, the Fomor attack, but the Avengers manage to defeat them by switching opponents. In retaliation, one of their foes, Cethlann, summons up her husband, Balor, a rampaging creature whose single eye emits a beam that causes Thor and the She-Hulk to vanish. In the confusion, Bres, the Fomor's precognitive member, invades Amergin's tower and uses the spell that summoned the Avengers to transport himself to the present.