You can unlock Electro Titan at Town Hall 14. She has a total of 4 upgrade levels.
Here are the max levels of Electro Titan:
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Balloon is an elixir troop in Clash of Clans, available at Town Hall 4. This unit has a total of 11 levels. Here are the max levels of Balloon: This troop has no upgrades available at TH5, TH10, and TH15.
Dragon Rider is an elixir troop in Clash of Clans, available at Town Hall 13. This unit has a total of 4 levels. Here are the max levels of Dragon Rider: This troop has no upgrade available at TH15.
Goblin is an elixir troop in Clash of Clans, available at Town Hall 2. This unit has a total of 9 levels. Here are the max levels of Goblin: This troop has no upgrades available at Town Halls 4, 6, 11, 13, 14, and 16.
Yeti is an elixir troop in Clash of Clans, available at Town Hall 12. This unit has a total of 6 levels. Here are the max levels of Yeti:
Miner is an elixir troop in Clash of Clans, available at Town Hall 10. This unit has a total of 10 levels. Here are the max levels of Miner: This troop has no upgrade available at TH16.
You can unlock Electro Dragon at Town Hall 11. It gets its first two upgrade levels at Town Hall 11, then certain max level caps apply to Electro Dragon. Here are the max levels of Electro Dragon: