methods to gain xp?

Xp can be obtained in the following ways:

1) ranking skills.
2) defeating a new teir of a given boss
3) completing a scripted quest.

Bxp from rp does not directly affect charachter xp, but does double skill xp gain for as equivilent degree to what would be required to gain 1% on the Bxp in Cxp. For example: a skill rank that will only give you 1 cxp will use 100 bxp, while a skill rank that will grant 250 cxp will slowly consume 25000 bxp to receive a boost the whole time.