Darkness_Enjoyer
Then i see no reason to put one to begin with. Your system should be replaced with mc deity. Knowledge, advice, and wisdom is something that can be expected from god. It is literally helpful for you to develop some relationship between mc and god. Other than that it doesn't provide any buff to the mc(those combat skills are unnecessary, just give the mc a skill that provides a bonus buff or something), how can it be useful?
Darkness_Enjoyer:I hope you read the part where I explained how the system works. Like you said, there is a 'power system' in the Danmachi world and the system alreasy obeys it. It wont make him stronger independent from the Falna system. It is just here to make the communication with the unknown god saved MC.
will they be in the harem?:danmachi---- Hestia-Ais Wallenstein-Ryuu Lion-Lefiya Viridis-Alicia Forestlight-Anakitty Autumn-Liliruca Arde-Line Arshe-Lyra-Artemis-Astraea-Meryl Tear-Eina Tulle-Misha Flott-Elfy Colette-Rose Fannett-Fina-Gojouno Kaguya-Tiona Hiryute-Tione Hiryute-Kali-Daphne Lauros-Cassandra Ilion