I was going for the ultimate tank caster, but ONLY 3 FORMA! [Lavos]' abilities synergies well along with the [Cedo] I have confidence this build can handle anything. Once I get another umbral forma I'll update this build, which only squeezes an extra 15% power strength to cap off at 205%.

I could push the range a little bit more but for my playstyle, it didn't really matter 145% is enough I like moving from room to room anyway so it's worked fine. I could push it to 175% but lose the extra armour I like.

179% Status duration seems to work fine because I mow or cut down anything in my way and with a [Condition Overload] melee it's just all status everywhere almost 100% of the time and efficiency I left the same because that also works well. Also, too much duration can eat into how often I can use my fourth. I can hold my ground if I need it and the transmutation destroys choke points. In survival, it works great and if there are enough enemies works well too. Still have to be smart about it though.

Power strength at 190% works fine, I'm just being greedy to get the 205% with the umbral. I see other people take it way high and that works really well, but the negative efficiency isn't to my taste with [Lavos] because I like casting. It's fun to room wipe but the dip in power makes deep waves funner for me.

Arcanes are a personal preference and you could add whatever here, but as aforementioned I am going to a mega tank to Grace and [Guardian] to take his insane armour even further.

I find pickups not being a big need for Lavos, and ample drops that can be picked up for ammo, so this build could also be a great Kubrow/Kavat frame. I don't use them too often because they often die too fast unless I am using [Inaros] or someone that tanky. But most of our tank frames aren't casters or you end up meleeing everything to shit (which I love don't get me wrong). With that in mind, this was a breath of fresh air, I can cast, shoot, survive, bring a pet and not worry about much.

UPDATE:
Immortal basically, takes Steel Path enemies to the face, his melee snakes heal way more than I originally planned for so that was awesome, gives me more variety in weapons to test. With that available, every 8 seconds, shorter with his 3rd cast I dropped Arcane Grace for Molt Augmented getting that extra power strength when going deep and with the [Cedo] tagging everything the rooms die. I added [Cunning Drift] because I feel the boost in the range is more noticeable than the boost in power would be.

I also really love running Smeeta Kavat, since I got up for 5 forma anyway I full-sent a 6th into an aura format so I can switch between [Corrosive Projection], [Growing Power] and Sheperd when the [Smeeta Kavat] procs the screen is oh so sweet.

UPDATE v2:
Found that I could get 300% power strength after 250 kills and a [Growing Power] Proc. It only got better.

UPDATE v3:
Still one of my toughest frames to kill.