Not sure about 3L5, but you want LW and Tireless, then it depends if your grping alot or mainly solo but I went Purge2, IP2, then Moparry 5. Aug stren 5, Mopain5, Aug Dex.... Debating on avoidence of magic coz the casters rip me a new one when im grping..... But a good caster train does that so.....
at higher RRs definitely include Ichor...it's a REALLY strong RA
don't know much about valewalkers in general, so can't help in detail. Just know that any class that can get ichor, should get it. It overwrites and removes root-immunities