This won't make a whole lot of sense without the corresponding melee weapon and all. However, in long missions where you can stack molt augmented, warcry brings you to 2700 armor and 118% bonus attack speed on top of [Berserker Fury]'s 70%. thats nearly 14,000 effective hit points which you can heal back up using hysteria in an instant, and 80% melee damage that stacks with ppp. [Gladiator Finesse] is... kind of useless other than the gladiator set bonus. If you ever find yourself needing it though, it's just more tankiness. For those who say stacking armor above 1,500 is overkill because of diminishing returns, i'd like you to consider something; the more resistance you stack, the more valuable each resistance point becomes. going from 50% damage resistance to 55% means you take 45% of the damage you receive instead of 50%; which is just a 10% damage decrease. However, those same 5% points applied to 90% means you have 95% resistance instead of 90%, which means you take 5% of the damage you receive instead of 10%, which is a 50% damage reduction. Those armor points may be diminishing in value, but as it gets more costly to increase resistance, that resistance itself becomes more valuable. on a frame with 1250 health like valk, this build gets you an over 10x effective hit point multiplier when warcry is active and conditions are met.

You can use 5 forma, or you can use an umbra forma. I'd just use regular forma though.

Those arcanes are tough to get your hands on too.