Hey everyone! I'd like to start out by saying I'm finally at my goal for my bishop (1hitting skele's) and I'm going to be making a night lord soon. I was curios about a type of hp washing where I would actually add into int on my thief just for hp washing. Then just training with my bishop. Does it work well and is it nessessary? Thank you!
The first thing you need to do is decide exactly how much HP you want your Night Lord to have and what level you want it by, then you can determine the kind of washing you need to do. There's actually a bit of detail about it in the NL guide: https://royals.ms/forum/threads/a-comprehensive-night-lord-guide.23303/#HPWashing
To directly answer your question, I made a Shadower with 130 base int from level 30+, and leeched it to 120 using my Bishop - the results are pretty good. I'm estimating about 7.5k HP by my mid 140's (this is without HB). Adding to base INT instead of using INT equips is an equal alternative, just keep in mind the cost of resetting that base INT in addition to the wash AP resets.