assassins can build merc treads and maw to mitigate my dmg to tickle them

but ninja tabis only mitigate auto attack damage, which assassins don't rely on too much. stopwatch doesn't provide any defense, zhonyas is on a long CD

there is literally nothing else

ADDITIONALLY, mages only get 2 sources of MPen and the second source costs 100g more, doesn't provide extra snazzy abilities, and the penetration = lethality at level 9-10