It's possible to get white rabbit rings in chaos dungeon but black rabbit rings are better. Lack the bonus stats but you will always get the extra action, vs maybe sometimes getting an action but you won't know if you got them until you finish your turn.
Reaching the end of the boss rush is worth around 1k-1.5k stats considering souls and the final reward, with major roadblocks being helkaiser and onimusha.
For princess of thorns specifically, aoe is the name of the game. The wheels become stunned if they reach 1% hp and the princess herself can't attack, all she does is buffs. If you have mary's wand you can use that to mass dispel the buffs, or alternatively use precision to make your dispel unavoidable however one of the buffs she can give is magic reflect so eventually you'd be unable to dispel with dispel leaving only mary's wand as an option. If you don't get the wheels to 1% hp reliably then use dodge. In that case though you also need to watch out for her giving precision to the wheels.
You'll probably also have trouble with onimusha who is in the same group. I'm certain I have posted about how to defeat her before so you can dig up tips with search.
BTW, princess of thorns' group is the last group before the final boss of the boss rush.
Reaching the end of the boss rush is worth around 1k-1.5k stats considering souls and the final reward, with major roadblocks being helkaiser and onimusha.
For princess of thorns specifically, aoe is the name of the game. The wheels become stunned if they reach 1% hp and the princess herself can't attack, all she does is buffs. If you have mary's wand you can use that to mass dispel the buffs, or alternatively use precision to make your dispel unavoidable however one of the buffs she can give is magic reflect so eventually you'd be unable to dispel with dispel leaving only mary's wand as an option. If you don't get the wheels to 1% hp reliably then use dodge. In that case though you also need to watch out for her giving precision to the wheels.
You'll probably also have trouble with onimusha who is in the same group. I'm certain I have posted about how to defeat her before so you can dig up tips with search.
BTW, princess of thorns' group is the last group before the final boss of the boss rush.