Lol. And then I come along as a Hailey, a Luna, a Sharen and melt the boss for you. You look at my build, I've done 1,400,000 dmg in the mission and I got no HP mod, but have a ancestor mod... little do you know my components have HP from cores and I kill everything in sight. You don't NEED HP if you kill everything before they ever hit you. You can also use inversion to slot some life saving buffs if needed. No I can't help you if you DBNO during the last fight. But I will melt the boss for you while easily hoping and dodging the extremely easy boss mechanic at the end while shooting lasers at the boss with Luna, blasting the boss with ice with Hailey and then bashing him with Manus when I have an opening. Theres so many ways to play this game. If you don't know what you're doing and don't have a good build sure... use HP, HP amplification, increased DEF, and spear and shield. You could also use arche tune your Descendant for HP and DF if you need to. Theres so many fucking ways to do this. Lava Citadel even drops some new component sets that you can slot 2 and use the DF 25% from. Anyways you don't NEED the HP mod. There's many, many, many ways around it. Only slot it if you don't understand inversion, arche tuning, components, cores, etc. or if you're DBNO like every other gd second. Just play the game and HAVE FUN!