IC stands for in-character. This is when one is playing as their elf. The opposite of IC is OOC. OOC stands for Out-of-character. This is when one is not playing as their elf.

Historical Background:
Imladris (Rivendell) and the Last Homely House were founded about 4750 years ago, in SA 1697, by Elrond, leading refugees from the fallen Noldo kingdom of Eregion. It withstood a siege by Sauron before being relieved. Elrond's children Arwen, Elrohir, and Elladan were born here. Their mother Celebrian passed oversea in TA 2510 because of injuries sustained when she was waylaid by orcs.

Interaction with other Cultures:
Relatively isolated, Imladris is tightly guarded against intruders. No evil things enter the Valley. Yet Imladris is more open to outsiders than the other elfhomes, and all free people are welcome if there is no malice in their hearts. Elves from other realms visit fairly often, and there is an occasional human or even dwarf seeking wise counsel or healing.

RP in the valley:
Elves are good, lovers of beauty, song and starlight. They have nothing to do with Sauron and his evil. They may seem so merry as to be silly, but this is a mistake, for there is wisdom - often sadness - beneath the gaiety. But the elves, Eru's Firstborn children, do not despair but take joy in Arda, Eru's creation. However, as sorrows, evil, and Men increase, more and more elves, wearying of the world, take ship to their final home, Eldamar in the West.