Here's a breakdown of the key ideas conveyed in the poem's ending:
* The speaker is consumed by grief and sorrow. The raven's relentless repetition of "Nevermore" reinforces the speaker's inability to escape his grief over Lenore's death.
* The speaker's hope for solace and comfort is crushed. The raven's ominous presence and pronouncements drive the speaker deeper into despair.
* The poem ends with a sense of utter isolation and alienation. The speaker is left alone with his grief, unable to find any relief or connection.
The poem's ending can be interpreted in different ways, but the prevailing theme is the overwhelming power of grief and the speaker's inability to move beyond it. The raven, as a symbol of death and the unknown, serves as a constant reminder of the speaker's loss and the finality of death.