Isarnia is probably your best bet for a titan team with -44% defense down. I’m still using her. Also with emblems superior dispel has increased her usefulness.
I’ve been leaning towards it too, but I’m very afraid of using 6 telescopes on a slow hero, that’s my finger, I already have it in 3/7 of the original and the fantasy.
For years I rarely used Isarnia outside of rush because she was slow. but with superior talent, I use her almost every war now just for the dispel with tiles.
If you aren’t convinced of your options, I would hold off until you have 12 scopes - or 10/11 if you’re a slow leveler.
It’s really annoying getting lucky and pulling a hero you would like to ascend and not being able to because you just used all of your 4* mats on someone you’re not really that excited about