Skeletons tend to go for the attack when you get within approx. 15ft (4.6m) of them. They have no dialogue.
Skeletons tend to run up and attack you with no real strategy. Countering and attacking normally is enough to defeat them. Long range spells like Fireball or Ice Nova are also very effective on Skeletons.
Skeletons drop whatever weapon they are holding, usually a basic sword or axe.'