Codex Fortress Frame
Frame Codex
Fortress Health Points Bonus
Where they can be found in game
@stickyoxtail on Discord gave a great explanation on Arc Tempest and Sentient Aegis; these were the only two Frames we had until recent updates added more. Now we have 6 Total. The Arc Tempest will be stronger I feel. This is from someone with max Sentient Aegis. The Frame scales with HP while the Arc Tempest scales with your Attack. There is no other way to boost your Fortress HP unless you max out the Fortress which takes a while and stack the Fortress +HP/-DMG reduction chips, which I have done. It can carry you wall into 70-80 but it's effectiveness will fall off. And then I find myself Building off it. But Wait He did more testing! His Arc Tempest frame is maxed 5 Star. At stages where you can't kill enemy mobs and they hit your fortress, the Arc Tempest puts out a good amount of damage, but, the stages where you need to kill mobs before they touch your fortress (missiles, meteor stages) the Sentient Aegis has more value. But... The Arc Tempest frame still increases your overall Health Points effectively boosting your Sentient Aegis frame. Ideally, you don't want any enemies touching your fortress but the meteor/missiles do way more DMG than other mobs so each of the two frame's value change with each stage. However, @stickyoxtail still believes the Arc Tempest is superior due to the sheer Potential damage output. (This is Mod Goat now btw) - I have played a lot of games in my life. The status quo in most is that a Potential Offense is much more valuable than a Potential Defense. This isn't to say that using one is more important than using the other. It just furthers the plot line that everything in this game has a pro and a con to consider when trying to pass that stage you are blocked on.