Quick questions

I'll keep it quick:

1. Does the chance to inflict a stack of the Withered debuff stack from different sources? That is: If my minions have Unholy Might (ascend. passive), will adding Withering Touch support to a minion skill or skills give that minion skill or skills 50%?
(I assume so, but it is so hard to test, and searching for this only gives results for "withered stacks"...)

2. Are arenas from pinnacle bosses affected by your atlas tree nodes?

3. Context: I play SSF ruthless, so low gear. I do ok (finished around rank 40 last league), yet I struggle with blighted maps of even low tier. When my framerate drops close to zero from all the clutter, I lose my orientation, and often get overwhelmed. Is there some trick to blighted maps?

thanks in advance

1. From what i know they do stack
2. Nope arena bosses are not influenced by atlas passibe tree
3. You need 2 rings with enchants : meteor tower leaves burning ground and freezing towers freaze for 0.2 second or something like that and you spam stun turrets + freeze ones only until tier 3 upgrade (not higher) with a bunch of enhanced towers and meteor towers. If a lane has too many imunities you can try to slam some minion towers either tier 3 or 4 with the increased HP version.

If you do in map blight take the less cost to upgrade towers on the atlas and just try to put the towers as mentioned above with the priority on frost + stun to lock them in place.

If you do blighted maps for starters use 3 x of the oil that reduce building costs that will help you do everything with little to no input but be sure you don't have the mod that does not let monsters get stunned of freazed (can't exactly remember if the one that didn't let monster freeze is the same with the one that does not let them have action speed lowered in any case both are bad).

Also worth mentioning don't take the node that makes a full lane to be with blight bosses if you don't play something with milions of dps (this is for T16 although it's hard in lower tier maps too) just don't.