The demonic axe and the +15 flat damage to all guns craft is not good enough for you?
The demonic axe still needs alot of TU and scales with strength. The force blade does the job better as long as you can find the gems.
While the Scarab is a useful addition it got nerfed @ this patch. +15 sounds okay but the vessel got no shield to negate repair-time and only 1xLw slot.
Early on you won't get enough supply to field 2xHw slots. Once crafts become too fast, the Scarap just can't compete with proper hellerium fighters.
With the same codex you get the green snake, that one has all 3 weapon types AND an inbuild shield.
Additionally it has an amazing "map" to take advantage of the roof and elevators to fight early monster hunts. The scarap isn't too hot in terms of a dropship.
The red codex is weak in comparision to other codexes, especially the green one.
You can get nearly everything the red codex offers with the green one so why bother about the nerfed scarab?
Edit: Don't get me started with the 'buffed' spike launcher the red codex offers. Spike rockets are inaccurate, have a small clipsize and are extremely expensive considering the early/midgame.
It's not worth the investment to shot your money into thin air and run into the possible situation that all 12 shots fail to connect.
I'd rather keep them in store and fuel a sentry/rocket turret with these. A long lasting investment great for crashsites and hideout-defenses.