How high should I take this skill in order to successfully clear city walls ? And, are there advantages to maxing it out?

50 is a must in my opinion.... it really helps clear those high walls.

75 not sure if it's an increase in height and don't know about 100 either.

this change pissed me off, I just started macroing it again and the next day they changed it. my launch is only 47 but i have found it sufficient for getting into cities. actually practicing using it is more important than the skill level imo. then again i plan to max it and telekinesis as well, but utility spells are my specialty.

I wouldn't take it over 50. For now, at least.

WTB Sulphur...

wtb ashes im working up telekinesis to take entire groups over walls in one cast. its getting close to being effective if you have ashes to sell let me know its using them up fast training it.
id say 75 for launch and you will never have issues after that