"
1. Does that lightning damage get reflected back at me? If so, can I block it (spellblock)?
Yes, and Yes. Tempest Shield's spell damage isn't any different to other spell damage in this respect - it can be reflected, and you can use spell block to mitigate the reflected damage.
"
2. Suppose I block reflected damage (either originating from Tempest Shield, or some other hit). Can Aegis Aurora's ES recovery effect trigger from this? Does the monster get hit by Tempest Shield as a result of the block?
No. While block is applied as mitigation to reflected damage, you don't actually count as blocking a hit - reflected damage that fails to result in an amount of damage is discarded and has no effect on either attacker or defender.
