DAoC roclar.net - Dark Age of Camelot

For skill/realm respec stones, turn in the appropriate stone to the corresponding NPC and then use the /respec (all for career, skill for single line and realm for realm) command in front of your class trainer.
After 1.76, you can use the /respec buy command to purchase single line respecs from anywhere in game. Costs for adding the respecs are found here. Just like with respec stones, to use the respec, you have to visit your class trainer.
Exerpise/Exeregum stones are dropped from the realms dragon in the "epic zone".
Abrogo stones drop in the Passages of Conflict and Summoners Hall. Ceriac stones drop in your realms SI epic dungeons.
King's Star of Destiny (4pp, must be CL2) and Luminescent Cambriare Stone (50gp must bt CL3) are purchasable from the quartermaster.
Once you use a star of destiny, your ML path is automagically switched.

Hall of Heroes: /use in front of the Table of Destiny - Star of Destiny - ML Respec

Camelot: Ellette Redding - Luminescent Exerpise Stone - Career Skill Respec
Camelot: Paiton Hazlett - Luminescent Exeregum Stone - Realm Skill Respec
Camelot: Paiton Hazlett - Luminescent Abrogo Stone - Realm Skill Respec
Humberton Castle: Mae Oswy - Luminescent Ceriac Stone - Single Line Skill Respec