This is a disguised list of:
LEGO board games. This makes sense of Hint 2's mention of 'Brick by brick'.
The clues should be interpreted as follows:
A solar eclipse
Sunblock (in an eclipse, the sun is blocked, usually by the moon)
6 Indy 500's
Race 3000 (since the Indianapolis 500 is a race, and $3000 = 6*500$)
Our saviour the half-wax bird
This clues the Heroica series of board games: 'saviour' = 'HERO', 'half-wax bird' = half of ICArus, the figure from Greek mythology who flew too close to the sun on wings of wax.
Orcs, goblins, drow, and ogres
Monster 4 - a list of 4 monsters!
A tornado siren
City Alarm i.e. something that might sound in the event of an emergency...
A stolen piece of wood
Pirate Plank ('stolen' = 'pirate', 'piece of wood' = 'plank')
/give @s minecraft_moon 1
Lunar Command (a command line relating to the moon)
Strange smears reappearing
Ramses Return - this is cryptic wordplay: SMEARS is an anagram of RAMSES, and 'reappearing' is a synonym of 'return'.
Initially, I thought this one was most likely to be Magma Monster, since "LAVAAAAAAAAAAAAAAAAAAAAA!" sounds like it could be the roar of such a beast. However, I also considered it might somehow clue 'Lava Dragon' and I really like @Amoz's suggestion that this is "Lava draggin' (dragging)", extending the word length in a cryptic way :)
The laws of the sea
Pirate Code (see Pirates of the Caribbean if in any doubt here...)
Doomfist's ultimate move
Meteor Strike - in Overwatch, the character Doomfist has a special move by this name...
The labyrinth guardian (and us!)
Minotaurus (since the minotaur guarded the Labyrinth in Greek myth) - this was the clue which gave the theme away to me, as I have this game in my collection!
Also, re the first Hint:
There is also a LEGO game called 'Lord of the Rings: The Battle of Helm's Deep' - as well as LEGO video games themed around both Lord of the Rings and The Hobbit - which makes the initial incorrect answer by @Vir (a Lord of the Rings theme) an uncanny coincidence!