Not familiar with SotDL despite having the PDFs since forever, but a single Bane in Draw Steel is a -2 to a roll. That's a pretty hefty penalty, as you are normally rolling 2d10+ a stat (that at best can start at 2), with maybe a +2 for skill if it's not an ability roll, and seeing which of the 11 or less/12-16/17 or higher tiers the roll falls into. Unlike 5e, you can also have a double bane, which doesn't give a numerical penalty but rather downgrades the result a whole tier. There are also edges, which work the other way around.