Thanks benbaxter.
I am talking about thorn whip here. I figured that this is a cool spell to use only against the enemies who are up high - pulling them down for falling damage, but it is rather difficult to ensure a hit due to a meek range and -2 low ground penalty. The range I'll overcome with Spell Sniper, but the hit chance I haven't yet settled on.
By 'autonomous' I meant those you can perform within one turn. So bardic inspiration works, as a reaction, but bless doesn't, because it needs to be cast in advance. Same with arrows and other specific conditions.
