((I have no mana, and penalties to working with anyone.
...Sweet.))
Head over to Section 6a, nab that mana shard.
Yeah, side effect of my gem compatibility system, and everyone else going for major splashy effects.
Even with any of the 'bound' gems not producing penalties, there's still others that did.
These penalties won't apply when in different fields.
Also, mana shards do not work that way, by shooting them with a gem in a tower (or really close trap) you collect the mana from it; this mana then goes into everyone's pools.
If you want, you have enough to make a trench, or to combine two gems together; or you could save up.
Just a reminder, your special ability is three times as effective with a trench.
Also, there is trying to stretch your limits. There's no risk of needing mana to banish monsters at the moment, as it will take a few turns for the first wave to reach your orbs. I could foresee you overcoming the penalty and succeeding at an action.
"No way- It's best to start with a freezing tower first, to whittle down their resistance to attacks!"
Create a Grade 2 Freezing towergem and place it in the tower-.... Wait... Is it possible for me and HFS to combine gems then put the combined one in the tower? If so, and if he agrees, do that. If he doesn't agree, then try to place mine in.
This is acceptable; you might get more bang for your buck by combining same-grade gems (he makes a grade 2, you make a 2, then combine).
"I have an idea - if at all possible, perhaps with someone elses' mana, why not turn that grade 2 gem into a grade 3, then combine it with the Fire gem? Grade 3 Fire/Freezing!"
My somewhat fluid math tables tell me that if Rune makes his grade 2, Sofia makes her grade 3, and everyone else contributes basically everything else they've got, you could together upgrade the grade 2 into a grade 3, then... not quite have enough to combine them; you could stretch your limits for a penalty, but this increases the odds of it being very flawed.
Or you could start with Claire's gem, upgrade that with her's and Rune's mana, and have Cromwell combine that with sofia's grade 3.