I just realized, urso engine with mega bonebiters deals percentile damage, which means that it never reduces when opponents have high hp and defense
urso engine with scutter's sunder and mudgill's shred could also be pretty nasty
Scutters steal shell would be good for that too but its currently isnt interacting with enemies' def as intended, in high loops (currently is reducing def by a much smaller amount than intended)
well I'm intending to have 999 atk+def using bulky tier 3 by the time I reach high loops, a little defense lowering would be important too.