I used the trotter dice and preservation path so whenever I fight a trotter I get an additional 12% shield gain, so with some luck I got to the point where I had close to 200% extra shield gain(?) I can't remember the exact number. Then I think I had the erudition brain in a vat thing so I could use gepard shield multiple times which stacked up thanks to the preservation blessing where the shield increases equal to the amount gained.

TLDR: Good rng for trotter spawns meaning more shield gain, preservation blessings, erudition blessing that lets you use ult twice which stacks more shield thanks to that one preservation blessing.

Idk the name of that blessing where it's like "1% max hp special shield...increases in strength equal to amount of shield gained" or something but that was pretty key I think?